- published: 30 Nov 2010
- views: 52746
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Cepheid Variables 1
More free lessons at: http://www.khanacademy.org/video?v=BWs-ONRDDG4
An introduction to the class of variable stars known as Cepheid variables and their use as standard candles for measuring cosmic distances. Covers Henrietta Leavitt's discovery of the relationship between period and luminosity and an example of how this was used to measure the distance to the Andromeda galaxy which proved the existence of other galaxies.
Here are the links to Henrietta Leavitt's key papers on Cepheid variables:
http://adsabs.harvard.edu/abs/1908AnHar..60...87L
http://adsabs.harvard.edu/abs/1912HarCi.173....1L
And a recent paper on V1 in the Andromeda galaxy including graphs of the light curves
http://arxiv.org/abs/1111.0262
Just click on the pdf link to see the documents
Let us know what you think of these videos by filling out our short survey at http://tinyurl.com/astronomy-pulsar. Thank you!
- published: 10 Aug 2012
- views: 11556
Cepheid variables, period/luminosity relation
For free videos and study notes, as well as online revision courses, go to
www.studynova.com
- published: 13 Oct 2012
- views: 2263
A "Cepheid variable" is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude.
A strong direct relationship between a Cepheid variable's luminosity and pulsation period secures for Cepheids their status as important distance indicators for establishing the galactic and extragalactic distance scales.
The term "Cepheid" originates from Delta Cephei in the constellation Cepheus, the first star of this type identified, by John Goodricke in 1784.
Cepheid variables are divided into several subclasses which exhibit markedly different masses, ages, and evolutionary histories: classical Cepheids, type II Cepheids, and anomalous Cepheids. Delta Scuti variables are A class stars on or near the main sequence at the lower end of the instability strip and were originally referred to as dwarf Cepheids. RR Lyrae variables have short periods and lie on the instability strip where it crosses the horizontal branch. Delta Scuti variables and RR Lyrae variables are not generally treated with Cepheid variables although their pulsations originate with the same helium ionisation kappa mechanism.
"Classical Cepheids" undergo pulsations with very regular periods on the order of days to months. Classical Cepheids are Population I variable stars which are 4–20 times more massive than the Sun, and up to 100,000 times more luminous. These Cepheids are yellow supergiants of spectral class F6 – K2 and their radii change by millions of kilometers during a pulsation cycle.
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Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK.
Background Music:
"The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library.
This video uses material/images from https://en.wikipedia.org/wiki/Cepheid+variable, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
- published: 29 Sep 2015
- views: 131
News from the Hubble Space Telescope, and Hubblecast. The great observatory has observed the variable star RS Puppis over a period of five weeks, showing the star growing brighter and dimmer. These pulsations have created a stunning example of a phenomenon known as a light echo, where light appears to reverberate through the murky environment around the star.
A pulsating star forms when most of its hydrogen fuel has been consumed. It then becomes unstable, expanding and shrinking over a number of days or weeks and growing brighter and dimmer as they do so.
A new Hubble image shows RS Puppis, a type of variable star known as a Cepheid variable. As variable stars go, Cepheids have comparatively long periods. RS Puppis, for example, varies in brightness by almost a factor of five every 40 or so days.
RS Puppis is enshrouded by a nebula — thick, dark clouds of gas and dust. Hubble observed this star and its murky environment over a period of five weeks in 2010, capturing snapshots at different stages in its cycle and enabling scientists to create a time-lapse video of this ethereal object.
The apparent motion shown in these Hubble observations is an example of a phenomenon known as a light echo. The dusty environment around RS Puppis enables this effect to be shown with stunning clarity. As the star expands and brightens, we see some of the light after it is reflected from progressively more distant shells of dust and gas surrounding the star, creating the illusion of gas moving outwards. This reflected light has further to travel, and so arrives at the Earth after light that travels straight from star to telescope. This is analogous to sound bouncing off surrounding objects, causing the listener to hear an audible echo.
While this effect is certainly striking in itself, there is another important scientific reason to observe Cepheids like RS Puppis. The period of their pulsations is known to be directly connected to their intrinsic brightness, a property that allows astronomers to use them as cosmic distance markers. A few years ago, astronomers used the light echo around RS Puppis to measure its distance from us, obtaining the most accurate measurement of a Cepheid's distance. Studying stars like RS Puppis helps us to measure and understand the vast scale of the Universe.
- published: 17 Dec 2013
- views: 57942
A Cepheid is a star that varies in light intensity over regular, measurable periods. The period of pulsation is directly related to a Cepheid's intrinsic brightness making observations of these stars a powerful tool for determining distance. This animation shows a Cepheid variable star varying in brightness in the arm of a spiral galaxy.
credit: NASA
source: http://svs.gsfc.nasa.gov/goto?10145
- published: 16 Jun 2010
- views: 4345
Henrietta Leavitt discovered the relation between the period and luminosity of cepheid variable stars. By using Henrietta's discovery, astronomers can estimate the distances to these stars and thus to their home galaxies. Her discovery became one of the foundations of modern cosmology.
Dallim Park
http://www.dallims.com
Grigor Dzhambazyan
http://waecky.com/
Javier Zumaeta
http://javanimation.blogspot.com/
Yet Chu
Vartan Simonian
http://www.vartansimonian.com/
http://sci-vi.calstatela.edu/index.php?option=com_content&task;=view&id;=21&Itemid;=9
- published: 09 Dec 2008
- views: 10887
http://www.teachastronomy.com/
Cepheid variables are luminous stars with variations in a range of periods of one to fifty days. The physics of their pulsation is well understood, and empirically for stars with well measured distance by parallax, there's a well determined relationship between the period of the pulsation and the luminosity of the star. More luminous Cepheids have longer periods. Astronomers therefore isolate Cepheids in a distant cluster by taking images over a period of several months to identify the variable stars and measure their periods. The period then leads to a prediction of the luminosity. That is combined with the apparent brightness to yield a distance. The Cepheid distance measurement technique is among the most accurate in astronomy with a precision of ten percent.
- published: 23 Jul 2010
- views: 1834
A Cepheid (
/ˈsɛfiːɪd/ or /ˈsiːfiːɪd/) is a member of a class of very luminous variable stars. The strong direct relationship between a Cepheid variable's luminosity and pulsation period secures for Cepheids their status as important standard candles for establishing the Galactic and extragalactic distance scales.
Cepheid variables are divided into several subclasses which exhibit markedly different masses, ages, and evolutionary histories: Classical Cepheids, Type II Cepheids, Anomalous Cepheids, and Dwarf Cepheids.
The term cepheid originates from Delta Cephei in the constellation Cepheus, the first star of this type identified, by John Goodricke in 1784. Delta Cephei is also of particular importance as a calibrator of the Cepheid period-luminosity relation since its distance is among the most precisely established for a Cepheid, thanks in part to its membership in a star cluster and the availability of precise Hubble Space Telescope/Hipparcos parallaxes.
Classical Cepheids (also known as Population I Cepheids, Type I Cepheids, or Delta Cephei variables) undergo pulsations with very regular periods on the order of days to months. Classical Cepheids are population I variable stars which are 4–20 times more massive than the Sun, and up to 100,000 times more luminous. Cepheids are yellow supergiants of spectral class F6 – K2 and their radii change by (~25% for the longer-period I Carinae) millions of kilometers during a pulsation cycle.
This page contains text from Wikipedia, the Free Encyclopedia -
http://en.wikipedia.org/wiki/Cepheid_variable
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
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9:23Cepheid Variables 1
Cepheid Variables 1Cepheid Variables 1
Cepheid Variables 1 More free lessons at: http://www.khanacademy.org/video?v=BWs-ONRDDG4 -
12:34Cosmic Distance Ladder: Cepheid Variables
Cosmic Distance Ladder: Cepheid VariablesCosmic Distance Ladder: Cepheid Variables
An introduction to the class of variable stars known as Cepheid variables and their use as standard candles for measuring cosmic distances. Covers Henrietta Leavitt's discovery of the relationship between period and luminosity and an example of how this was used to measure the distance to the Andromeda galaxy which proved the existence of other galaxies. Here are the links to Henrietta Leavitt's key papers on Cepheid variables: http://adsabs.harvard.edu/abs/1908AnHar..60...87L http://adsabs.harvard.edu/abs/1912HarCi.173....1L And a recent paper on V1 in the Andromeda galaxy including graphs of the light curves http://arxiv.org/abs/1111.0262 Just click on the pdf link to see the documents Let us know what you think of these videos by filling out our short survey at http://tinyurl.com/astronomy-pulsar. Thank you! -
0:48Animation of a variable star
Animation of a variable star -
14:17Astrophysics - Distance - Cepheid variables (1/2) - (IB Physics, GCSE, A level, AP)
Astrophysics - Distance - Cepheid variables (1/2) - (IB Physics, GCSE, A level, AP)Astrophysics - Distance - Cepheid variables (1/2) - (IB Physics, GCSE, A level, AP)
Cepheid variables, period/luminosity relation For free videos and study notes, as well as online revision courses, go to www.studynova.com -
2:10Cepheid variable - Video Learning - WizScience.com
Cepheid variable - Video Learning - WizScience.comCepheid variable - Video Learning - WizScience.com
A "Cepheid variable" is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude. A strong direct relationship between a Cepheid variable's luminosity and pulsation period secures for Cepheids their status as important distance indicators for establishing the galactic and extragalactic distance scales. The term "Cepheid" originates from Delta Cephei in the constellation Cepheus, the first star of this type identified, by John Goodricke in 1784. Cepheid variables are divided into several subclasses which exhibit markedly different masses, ages, and evolutionary histories: classical Cepheids, type II Cepheids, and anomalous Cepheids. Delta Scuti variables are A class stars on or near the main sequence at the lower end of the instability strip and were originally referred to as dwarf Cepheids. RR Lyrae variables have short periods and lie on the instability strip where it crosses the horizontal branch. Delta Scuti variables and RR Lyrae variables are not generally treated with Cepheid variables although their pulsations originate with the same helium ionisation kappa mechanism. "Classical Cepheids" undergo pulsations with very regular periods on the order of days to months. Classical Cepheids are Population I variable stars which are 4–20 times more massive than the Sun, and up to 100,000 times more luminous. These Cepheids are yellow supergiants of spectral class F6 – K2 and their radii change by millions of kilometers during a pulsation cycle. Wiz Science™ is "the" learning channel for children and all ages. SUBSCRIBE TODAY Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK. Background Music: "The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library. This video uses material/images from https://en.wikipedia.org/wiki/Cepheid+variable, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms. -
3:55Strange Case of the Pulsating Star
Strange Case of the Pulsating StarStrange Case of the Pulsating Star
News from the Hubble Space Telescope, and Hubblecast. The great observatory has observed the variable star RS Puppis over a period of five weeks, showing the star growing brighter and dimmer. These pulsations have created a stunning example of a phenomenon known as a light echo, where light appears to reverberate through the murky environment around the star. A pulsating star forms when most of its hydrogen fuel has been consumed. It then becomes unstable, expanding and shrinking over a number of days or weeks and growing brighter and dimmer as they do so. A new Hubble image shows RS Puppis, a type of variable star known as a Cepheid variable. As variable stars go, Cepheids have comparatively long periods. RS Puppis, for example, varies in brightness by almost a factor of five every 40 or so days. RS Puppis is enshrouded by a nebula — thick, dark clouds of gas and dust. Hubble observed this star and its murky environment over a period of five weeks in 2010, capturing snapshots at different stages in its cycle and enabling scientists to create a time-lapse video of this ethereal object. The apparent motion shown in these Hubble observations is an example of a phenomenon known as a light echo. The dusty environment around RS Puppis enables this effect to be shown with stunning clarity. As the star expands and brightens, we see some of the light after it is reflected from progressively more distant shells of dust and gas surrounding the star, creating the illusion of gas moving outwards. This reflected light has further to travel, and so arrives at the Earth after light that travels straight from star to telescope. This is analogous to sound bouncing off surrounding objects, causing the listener to hear an audible echo. While this effect is certainly striking in itself, there is another important scientific reason to observe Cepheids like RS Puppis. The period of their pulsations is known to be directly connected to their intrinsic brightness, a property that allows astronomers to use them as cosmic distance markers. A few years ago, astronomers used the light echo around RS Puppis to measure its distance from us, obtaining the most accurate measurement of a Cepheid's distance. Studying stars like RS Puppis helps us to measure and understand the vast scale of the Universe. -
2:21Determining Distances with Cepheid Variable Stars
Determining Distances with Cepheid Variable Stars -
0:31Cepheid Variable in Spiral Galaxy [720p]
Cepheid Variable in Spiral Galaxy [720p]Cepheid Variable in Spiral Galaxy [720p]
A Cepheid is a star that varies in light intensity over regular, measurable periods. The period of pulsation is directly related to a Cepheid's intrinsic brightness making observations of these stars a powerful tool for determining distance. This animation shows a Cepheid variable star varying in brightness in the arm of a spiral galaxy. credit: NASA source: http://svs.gsfc.nasa.gov/goto?10145 -
6:49the Cepheids
the Cepheidsthe Cepheids
Henrietta Leavitt discovered the relation between the period and luminosity of cepheid variable stars. By using Henrietta's discovery, astronomers can estimate the distances to these stars and thus to their home galaxies. Her discovery became one of the foundations of modern cosmology. Dallim Park http://www.dallims.com Grigor Dzhambazyan http://waecky.com/ Javier Zumaeta http://javanimation.blogspot.com/ Yet Chu Vartan Simonian http://www.vartansimonian.com/ http://sci-vi.calstatela.edu/index.php?option=com_content&task;=view&id;=21&Itemid;=9 -
0:56Teach Astronomy - Distances from Cepheid Variables
Teach Astronomy - Distances from Cepheid VariablesTeach Astronomy - Distances from Cepheid Variables
http://www.teachastronomy.com/ Cepheid variables are luminous stars with variations in a range of periods of one to fifty days. The physics of their pulsation is well understood, and empirically for stars with well measured distance by parallax, there's a well determined relationship between the period of the pulsation and the luminosity of the star. More luminous Cepheids have longer periods. Astronomers therefore isolate Cepheids in a distant cluster by taking images over a period of several months to identify the variable stars and measure their periods. The period then leads to a prediction of the luminosity. That is combined with the apparent brightness to yield a distance. The Cepheid distance measurement technique is among the most accurate in astronomy with a precision of ten percent. -
6:25vid 7, Option E, Cepheid Variable Stars
vid 7, Option E, Cepheid Variable Starsvid 7, Option E, Cepheid Variable Stars
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4:41Louise Haiman -- Getaway Drive (Heinrich Müller Cepheid Variable Remodel)
Louise Haiman -- Getaway Drive (Heinrich Müller Cepheid Variable Remodel) -
6:31Mick Welch - Cepheid Variable
Mick Welch - Cepheid VariableMick Welch - Cepheid Variable
*** If You are the one who owns a copyright for this track and you do not wish to have this kind of promotion on YouTube, please let me know and I will remove the video immediately. *** More info about the track: -------------------------------- Artist: Mick Welch EP: Intergalactic Space Odyssey (2013) Label: Inner Shift Music http://www.discogs.com/Various-Intergalactic-Space-Odyssey/release/4655763 -
5:40Kiritainment - Cepheid Variable [Original Song]
Kiritainment - Cepheid Variable [Original Song]Kiritainment - Cepheid Variable [Original Song]
- Algol variable
- Alpha Cygni variable
- Andromeda Galaxy
- Anomalous Cepheids
- ArXiv
- Beta Cephei variable
- Beta Doradus
- Beta Lyrae variable
- Bibcode
- BL Hercules
- BL Herculis variable
- Blind Alley
- BY Draconis variable
- Cepheid variable
- Classical Cepheids
- Delta Cephei
- Delta Scuti
- Delta Scuti variable
- Dwarf Cepheids
- Dwarf nova
- Eclipsing binary
- Edward Pigott
- Edwin Hubble
- Ejnar Hertzsprung
- Eta Aquilae
- Flare star
- FU Orionis star
- Galactic center
- Galaxies
- Galaxy
- Georges Lemaître
- Globular clusters
- Harlow Shapley
- HD 84810
- Helium
- Herbig Ae Be stars
- Hipparcos
- Hubble constant
- Hubble's Law
- Ionization
- John Goodricke
- Local Group
- Long period variable
- Luminosity
- Magellanic Clouds
- Main Sequence
- Metallicity
- Milky Way
- Milton L. Humason
- Mira variable
- Nova
- Orion variable
- Passband
- Periodic function
- Polaris
- Population I
- Population II
- Portal Star
- Pulsar
- RR Lyrae variable
- RR Lyrae variables
- RT Aurigae
- RV Tauri variable
- Semiregular variable
- Standard candle
- Star cluster
- Supernova
- SX Phoenicis
- Type II Cepheids
- Variable star
- Variable stars
- Vesto Slipher
- W Virginis
- W Virginis variable
- Walter Baade
- Wolf-Rayet star
- WP V
- Zeta Geminorum
- Κ-mechanism
-
Cepheid Variables 1
Cepheid Variables 1 More free lessons at: http://www.khanacademy.org/video?v=BWs-ONRDDG4 -
Cosmic Distance Ladder: Cepheid Variables
An introduction to the class of variable stars known as Cepheid variables and their use as standard candles for measuring cosmic distances. Covers Henrietta Leavitt's discovery of the relationship between period and luminosity and an example of how this was used to measure the distance to the Andromeda galaxy which proved the existence of other galaxies. Here are the links to Henrietta Leavitt's key papers on Cepheid variables: http://adsabs.harvard.edu/abs/1908AnHar..60...87L http://adsabs.harvard.edu/abs/1912HarCi.173....1L And a recent paper on V1 in the Andromeda galaxy including graphs of the light curves http://arxiv.org/abs/1111.0262 Just click on the pdf link to see the documents Let us know what you think of these videos by filling out our short survey at http://tinyurl.com/a... -
-
Astrophysics - Distance - Cepheid variables (1/2) - (IB Physics, GCSE, A level, AP)
Cepheid variables, period/luminosity relation For free videos and study notes, as well as online revision courses, go to www.studynova.com -
Cepheid variable - Video Learning - WizScience.com
A "Cepheid variable" is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude. A strong direct relationship between a Cepheid variable's luminosity and pulsation period secures for Cepheids their status as important distance indicators for establishing the galactic and extragalactic distance scales. The term "Cepheid" originates from Delta Cephei in the constellation Cepheus, the first star of this type identified, by John Goodricke in 1784. Cepheid variables are divided into several subclasses which exhibit markedly different masses, ages, and evolutionary histories: classical Cepheids, type II Cepheids, and anomalous Cepheids. Delta Scuti variables are A class stars on or near the ... -
Strange Case of the Pulsating Star
News from the Hubble Space Telescope, and Hubblecast. The great observatory has observed the variable star RS Puppis over a period of five weeks, showing the star growing brighter and dimmer. These pulsations have created a stunning example of a phenomenon known as a light echo, where light appears to reverberate through the murky environment around the star. A pulsating star forms when most of its hydrogen fuel has been consumed. It then becomes unstable, expanding and shrinking over a number of days or weeks and growing brighter and dimmer as they do so. A new Hubble image shows RS Puppis, a type of variable star known as a Cepheid variable. As variable stars go, Cepheids have comparatively long periods. RS Puppis, for example, varies in brightness by almost a factor of five every 40 o... -
-
Cepheid Variable in Spiral Galaxy [720p]
A Cepheid is a star that varies in light intensity over regular, measurable periods. The period of pulsation is directly related to a Cepheid's intrinsic brightness making observations of these stars a powerful tool for determining distance. This animation shows a Cepheid variable star varying in brightness in the arm of a spiral galaxy. credit: NASA source: http://svs.gsfc.nasa.gov/goto?10145 -
the Cepheids
Henrietta Leavitt discovered the relation between the period and luminosity of cepheid variable stars. By using Henrietta's discovery, astronomers can estimate the distances to these stars and thus to their home galaxies. Her discovery became one of the foundations of modern cosmology. Dallim Park http://www.dallims.com Grigor Dzhambazyan http://waecky.com/ Javier Zumaeta http://javanimation.blogspot.com/ Yet Chu Vartan Simonian http://www.vartansimonian.com/ http://sci-vi.calstatela.edu/index.php?option=com_content&task;=view&id;=21&Itemid;=9 -
Teach Astronomy - Distances from Cepheid Variables
http://www.teachastronomy.com/ Cepheid variables are luminous stars with variations in a range of periods of one to fifty days. The physics of their pulsation is well understood, and empirically for stars with well measured distance by parallax, there's a well determined relationship between the period of the pulsation and the luminosity of the star. More luminous Cepheids have longer periods. Astronomers therefore isolate Cepheids in a distant cluster by taking images over a period of several months to identify the variable stars and measure their periods. The period then leads to a prediction of the luminosity. That is combined with the apparent brightness to yield a distance. The Cepheid distance measurement technique is among the most accurate in astronomy with a precision of ten... -
vid 7, Option E, Cepheid Variable Stars
-
-
Mick Welch - Cepheid Variable
*** If You are the one who owns a copyright for this track and you do not wish to have this kind of promotion on YouTube, please let me know and I will remove the video immediately. *** More info about the track: -------------------------------- Artist: Mick Welch EP: Intergalactic Space Odyssey (2013) Label: Inner Shift Music http://www.discogs.com/Various-Intergalactic-Space-Odyssey/release/4655763 -
Kiritainment - Cepheid Variable [Original Song]
-
Cepheid Variables.mp4
Information about Cepheid Variables for GCSE astronomy Visit www.astronomygcse.co.uk for more -
Shag Harbor - Cepheid Variable (NEW SINGLE!)
Official release of the first single from Shag Harbor's upcoming album "This World is Not Ours" available via Wartime Records. Album Release Date: TBA Facebook: http://facebook.com/shagharbor -
Cepheid Variable Method
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Cepheid Variable Star Light Curve Analysis
http://demonstrations.wolfram.com/CepheidVariableStarLightCurveAnalysis/ The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. This Demonstration analyzes a series of values for apparent magnitude (red band) versus time for a Cepheid variable star. The star has a period of 2.21138771 days based on a best fit of the signal. The x axis represents time folded at different period l... Contributed by: Jeff Bryant Based on work by: MACHO Project and Pavlos Protopapas (Harvard's Initiative in Innovative Computing) -
Cosmology: twinkle twinkle little cepheid variable... young earth?
First off, I have no idea why the motion quality is so bad on the film, I'll check my hardware settings to see if there are any driver issues. Second, the science: Cepheids do play a vital part as 'standard candles' in determining the size of the Universe, but the details of their variations are not well understood. Dr Penny said, "One hundred years ago Polaris varied by 10%, but over the last century the variations became smaller and smaller until ten years ago it only varied by 2%. "The precision of distance measurements based on the period-luminosity relation depends primarily on the precision with which the distance of some Cepheid is known." "[Polaris] has a period of 3.9696 days and varies .1 magnitudes in brightness, which is imperceptible by the human eye. Its period (an... -
Milky Way, Dimensions, Cepheid Variables, Location of Center of Milky Way
This video discusses the dimensions of the Milky Way Galaxy. The Cepheid variable stars are discussed. The use of Cepheid variables as a standard candle is discussed. Shapley's determination of the location of the center of the Milky Way is discussed. This material relates to Chapter 14 of astronomynotes.com. Introductory Astronomy Prof. Greg Clements -
Classical Cepheid variable - Video Learning - WizScience.com
"Classical Cepheids" are a type of Cepheid variable star. They are population I variable stars that exhibit regular radial pulsations with periods of a few days to a few weeks and visual amplitudes from a few tenths of a magnitude to about 2 magnitudes. There exists a well-defined relationship between a classical Cepheid variable's luminosity and pulsation period, securing Cepheids as viable standard candles for establishing the Galactic and extragalactic distance scales. HST observations of classical Cepheid variables have enabled firmer constraints on Hubble's law. Classical Cepheids have also been used to clarify many characteristics of our galaxy, such as the Sun's height above the galactic plane and the Galaxy's local spiral structure. Around 800 classical Cepheids ... -
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Cepheid variable Meaning
Video shows what cepheid variable means. A radially pulsating (expanding and contracting) variable star with a regular period and known relationship between period and intrinsic brightness.. Cepheid variable Meaning. How to pronounce, definition audio dictionary. How to say cepheid variable. Powered by MaryTTS, Wiktionary
Cepheid Variables 1
- Order: Reorder
- Duration: 9:23
- Updated: 30 Nov 2010
- views: 52746
Cepheid Variables 1
More free lessons at: http://www.khanacademy.org/video?v=BWs-ONRDDG4
Cepheid Variables 1
More free lessons at: http://www.khanacademy.org/video?v=BWs-ONRDDG4
wn.com/Cepheid Variables 1
Cepheid Variables 1
More free lessons at: http://www.khanacademy.org/video?v=BWs-ONRDDG4
- published: 30 Nov 2010
- views: 52746
Cosmic Distance Ladder: Cepheid Variables
- Order: Reorder
- Duration: 12:34
- Updated: 10 Aug 2012
- views: 11556
An introduction to the class of variable stars known as Cepheid variables and their use as standard candles for measuring cosmic distances. Covers Henrietta Le...
An introduction to the class of variable stars known as Cepheid variables and their use as standard candles for measuring cosmic distances. Covers Henrietta Leavitt's discovery of the relationship between period and luminosity and an example of how this was used to measure the distance to the Andromeda galaxy which proved the existence of other galaxies.
Here are the links to Henrietta Leavitt's key papers on Cepheid variables:
http://adsabs.harvard.edu/abs/1908AnHar..60...87L
http://adsabs.harvard.edu/abs/1912HarCi.173....1L
And a recent paper on V1 in the Andromeda galaxy including graphs of the light curves
http://arxiv.org/abs/1111.0262
Just click on the pdf link to see the documents
Let us know what you think of these videos by filling out our short survey at http://tinyurl.com/astronomy-pulsar. Thank you!
wn.com/Cosmic Distance Ladder Cepheid Variables
An introduction to the class of variable stars known as Cepheid variables and their use as standard candles for measuring cosmic distances. Covers Henrietta Leavitt's discovery of the relationship between period and luminosity and an example of how this was used to measure the distance to the Andromeda galaxy which proved the existence of other galaxies.
Here are the links to Henrietta Leavitt's key papers on Cepheid variables:
http://adsabs.harvard.edu/abs/1908AnHar..60...87L
http://adsabs.harvard.edu/abs/1912HarCi.173....1L
And a recent paper on V1 in the Andromeda galaxy including graphs of the light curves
http://arxiv.org/abs/1111.0262
Just click on the pdf link to see the documents
Let us know what you think of these videos by filling out our short survey at http://tinyurl.com/astronomy-pulsar. Thank you!
- published: 10 Aug 2012
- views: 11556
Animation of a variable star
- Order: Reorder
- Duration: 0:48
- Updated: 17 Dec 2013
- views: 5024
This artist's illustration shows a star turning into a variable star, expanding and shrinking — growing brighter and dimmer as it does so.
More information and...
This artist's illustration shows a star turning into a variable star, expanding and shrinking — growing brighter and dimmer as it does so.
More information and download options:
http://www.spacetelescope.org/videos/heic1323j/
Credit: NASA, ESA, M. Kornmesser
wn.com/Animation Of A Variable Star
Astrophysics - Distance - Cepheid variables (1/2) - (IB Physics, GCSE, A level, AP)
- Order: Reorder
- Duration: 14:17
- Updated: 13 Oct 2012
- views: 2263
Cepheid variables, period/luminosity relation
For free videos and study notes, as well as online revision courses, go to
www.studynova.com
Cepheid variables, period/luminosity relation
For free videos and study notes, as well as online revision courses, go to
www.studynova.com
wn.com/Astrophysics Distance Cepheid Variables (1 2) (Ib Physics, Gcse, A Level, Ap)
Cepheid variables, period/luminosity relation
For free videos and study notes, as well as online revision courses, go to
www.studynova.com
- published: 13 Oct 2012
- views: 2263
Cepheid variable - Video Learning - WizScience.com
- Order: Reorder
- Duration: 2:10
- Updated: 29 Sep 2015
- views: 131
A "Cepheid variable" is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable perio...
A "Cepheid variable" is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude.
A strong direct relationship between a Cepheid variable's luminosity and pulsation period secures for Cepheids their status as important distance indicators for establishing the galactic and extragalactic distance scales.
The term "Cepheid" originates from Delta Cephei in the constellation Cepheus, the first star of this type identified, by John Goodricke in 1784.
Cepheid variables are divided into several subclasses which exhibit markedly different masses, ages, and evolutionary histories: classical Cepheids, type II Cepheids, and anomalous Cepheids. Delta Scuti variables are A class stars on or near the main sequence at the lower end of the instability strip and were originally referred to as dwarf Cepheids. RR Lyrae variables have short periods and lie on the instability strip where it crosses the horizontal branch. Delta Scuti variables and RR Lyrae variables are not generally treated with Cepheid variables although their pulsations originate with the same helium ionisation kappa mechanism.
"Classical Cepheids" undergo pulsations with very regular periods on the order of days to months. Classical Cepheids are Population I variable stars which are 4–20 times more massive than the Sun, and up to 100,000 times more luminous. These Cepheids are yellow supergiants of spectral class F6 – K2 and their radii change by millions of kilometers during a pulsation cycle.
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Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK.
Background Music:
"The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library.
This video uses material/images from https://en.wikipedia.org/wiki/Cepheid+variable, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
wn.com/Cepheid Variable Video Learning Wizscience.Com
A "Cepheid variable" is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude.
A strong direct relationship between a Cepheid variable's luminosity and pulsation period secures for Cepheids their status as important distance indicators for establishing the galactic and extragalactic distance scales.
The term "Cepheid" originates from Delta Cephei in the constellation Cepheus, the first star of this type identified, by John Goodricke in 1784.
Cepheid variables are divided into several subclasses which exhibit markedly different masses, ages, and evolutionary histories: classical Cepheids, type II Cepheids, and anomalous Cepheids. Delta Scuti variables are A class stars on or near the main sequence at the lower end of the instability strip and were originally referred to as dwarf Cepheids. RR Lyrae variables have short periods and lie on the instability strip where it crosses the horizontal branch. Delta Scuti variables and RR Lyrae variables are not generally treated with Cepheid variables although their pulsations originate with the same helium ionisation kappa mechanism.
"Classical Cepheids" undergo pulsations with very regular periods on the order of days to months. Classical Cepheids are Population I variable stars which are 4–20 times more massive than the Sun, and up to 100,000 times more luminous. These Cepheids are yellow supergiants of spectral class F6 – K2 and their radii change by millions of kilometers during a pulsation cycle.
Wiz Science™ is "the" learning channel for children and all ages.
SUBSCRIBE TODAY
Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK.
Background Music:
"The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library.
This video uses material/images from https://en.wikipedia.org/wiki/Cepheid+variable, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
- published: 29 Sep 2015
- views: 131
Strange Case of the Pulsating Star
- Order: Reorder
- Duration: 3:55
- Updated: 17 Dec 2013
- views: 57942
News from the Hubble Space Telescope, and Hubblecast. The great observatory has observed the variable star RS Puppis over a period of five weeks, showing the st...
News from the Hubble Space Telescope, and Hubblecast. The great observatory has observed the variable star RS Puppis over a period of five weeks, showing the star growing brighter and dimmer. These pulsations have created a stunning example of a phenomenon known as a light echo, where light appears to reverberate through the murky environment around the star.
A pulsating star forms when most of its hydrogen fuel has been consumed. It then becomes unstable, expanding and shrinking over a number of days or weeks and growing brighter and dimmer as they do so.
A new Hubble image shows RS Puppis, a type of variable star known as a Cepheid variable. As variable stars go, Cepheids have comparatively long periods. RS Puppis, for example, varies in brightness by almost a factor of five every 40 or so days.
RS Puppis is enshrouded by a nebula — thick, dark clouds of gas and dust. Hubble observed this star and its murky environment over a period of five weeks in 2010, capturing snapshots at different stages in its cycle and enabling scientists to create a time-lapse video of this ethereal object.
The apparent motion shown in these Hubble observations is an example of a phenomenon known as a light echo. The dusty environment around RS Puppis enables this effect to be shown with stunning clarity. As the star expands and brightens, we see some of the light after it is reflected from progressively more distant shells of dust and gas surrounding the star, creating the illusion of gas moving outwards. This reflected light has further to travel, and so arrives at the Earth after light that travels straight from star to telescope. This is analogous to sound bouncing off surrounding objects, causing the listener to hear an audible echo.
While this effect is certainly striking in itself, there is another important scientific reason to observe Cepheids like RS Puppis. The period of their pulsations is known to be directly connected to their intrinsic brightness, a property that allows astronomers to use them as cosmic distance markers. A few years ago, astronomers used the light echo around RS Puppis to measure its distance from us, obtaining the most accurate measurement of a Cepheid's distance. Studying stars like RS Puppis helps us to measure and understand the vast scale of the Universe.
wn.com/Strange Case Of The Pulsating Star
News from the Hubble Space Telescope, and Hubblecast. The great observatory has observed the variable star RS Puppis over a period of five weeks, showing the star growing brighter and dimmer. These pulsations have created a stunning example of a phenomenon known as a light echo, where light appears to reverberate through the murky environment around the star.
A pulsating star forms when most of its hydrogen fuel has been consumed. It then becomes unstable, expanding and shrinking over a number of days or weeks and growing brighter and dimmer as they do so.
A new Hubble image shows RS Puppis, a type of variable star known as a Cepheid variable. As variable stars go, Cepheids have comparatively long periods. RS Puppis, for example, varies in brightness by almost a factor of five every 40 or so days.
RS Puppis is enshrouded by a nebula — thick, dark clouds of gas and dust. Hubble observed this star and its murky environment over a period of five weeks in 2010, capturing snapshots at different stages in its cycle and enabling scientists to create a time-lapse video of this ethereal object.
The apparent motion shown in these Hubble observations is an example of a phenomenon known as a light echo. The dusty environment around RS Puppis enables this effect to be shown with stunning clarity. As the star expands and brightens, we see some of the light after it is reflected from progressively more distant shells of dust and gas surrounding the star, creating the illusion of gas moving outwards. This reflected light has further to travel, and so arrives at the Earth after light that travels straight from star to telescope. This is analogous to sound bouncing off surrounding objects, causing the listener to hear an audible echo.
While this effect is certainly striking in itself, there is another important scientific reason to observe Cepheids like RS Puppis. The period of their pulsations is known to be directly connected to their intrinsic brightness, a property that allows astronomers to use them as cosmic distance markers. A few years ago, astronomers used the light echo around RS Puppis to measure its distance from us, obtaining the most accurate measurement of a Cepheid's distance. Studying stars like RS Puppis helps us to measure and understand the vast scale of the Universe.
- published: 17 Dec 2013
- views: 57942
Determining Distances with Cepheid Variable Stars
- Order: Reorder
- Duration: 2:21
- Updated: 04 Apr 2014
- views: 1083
Cepheid Variable in Spiral Galaxy [720p]
- Order: Reorder
- Duration: 0:31
- Updated: 16 Jun 2010
- views: 4345
A Cepheid is a star that varies in light intensity over regular, measurable periods. The period of pulsation is directly related to a Cepheid's intrinsic bright...
A Cepheid is a star that varies in light intensity over regular, measurable periods. The period of pulsation is directly related to a Cepheid's intrinsic brightness making observations of these stars a powerful tool for determining distance. This animation shows a Cepheid variable star varying in brightness in the arm of a spiral galaxy.
credit: NASA
source: http://svs.gsfc.nasa.gov/goto?10145
wn.com/Cepheid Variable In Spiral Galaxy 720P
A Cepheid is a star that varies in light intensity over regular, measurable periods. The period of pulsation is directly related to a Cepheid's intrinsic brightness making observations of these stars a powerful tool for determining distance. This animation shows a Cepheid variable star varying in brightness in the arm of a spiral galaxy.
credit: NASA
source: http://svs.gsfc.nasa.gov/goto?10145
- published: 16 Jun 2010
- views: 4345
the Cepheids
- Order: Reorder
- Duration: 6:49
- Updated: 09 Dec 2008
- views: 10887
Henrietta Leavitt discovered the relation between the period and luminosity of cepheid variable stars. By using Henrietta's discovery, astronomers can estimate ...
Henrietta Leavitt discovered the relation between the period and luminosity of cepheid variable stars. By using Henrietta's discovery, astronomers can estimate the distances to these stars and thus to their home galaxies. Her discovery became one of the foundations of modern cosmology.
Dallim Park
http://www.dallims.com
Grigor Dzhambazyan
http://waecky.com/
Javier Zumaeta
http://javanimation.blogspot.com/
Yet Chu
Vartan Simonian
http://www.vartansimonian.com/
http://sci-vi.calstatela.edu/index.php?option=com_content&task;=view&id;=21&Itemid;=9
wn.com/The Cepheids
Henrietta Leavitt discovered the relation between the period and luminosity of cepheid variable stars. By using Henrietta's discovery, astronomers can estimate the distances to these stars and thus to their home galaxies. Her discovery became one of the foundations of modern cosmology.
Dallim Park
http://www.dallims.com
Grigor Dzhambazyan
http://waecky.com/
Javier Zumaeta
http://javanimation.blogspot.com/
Yet Chu
Vartan Simonian
http://www.vartansimonian.com/
http://sci-vi.calstatela.edu/index.php?option=com_content&task;=view&id;=21&Itemid;=9
- published: 09 Dec 2008
- views: 10887
Teach Astronomy - Distances from Cepheid Variables
- Order: Reorder
- Duration: 0:56
- Updated: 23 Jul 2010
- views: 1834
http://www.teachastronomy.com/
Cepheid variables are luminous stars with variations in a range of periods of one to fifty days. The physics of their pulsation ...
http://www.teachastronomy.com/
Cepheid variables are luminous stars with variations in a range of periods of one to fifty days. The physics of their pulsation is well understood, and empirically for stars with well measured distance by parallax, there's a well determined relationship between the period of the pulsation and the luminosity of the star. More luminous Cepheids have longer periods. Astronomers therefore isolate Cepheids in a distant cluster by taking images over a period of several months to identify the variable stars and measure their periods. The period then leads to a prediction of the luminosity. That is combined with the apparent brightness to yield a distance. The Cepheid distance measurement technique is among the most accurate in astronomy with a precision of ten percent.
wn.com/Teach Astronomy Distances From Cepheid Variables
http://www.teachastronomy.com/
Cepheid variables are luminous stars with variations in a range of periods of one to fifty days. The physics of their pulsation is well understood, and empirically for stars with well measured distance by parallax, there's a well determined relationship between the period of the pulsation and the luminosity of the star. More luminous Cepheids have longer periods. Astronomers therefore isolate Cepheids in a distant cluster by taking images over a period of several months to identify the variable stars and measure their periods. The period then leads to a prediction of the luminosity. That is combined with the apparent brightness to yield a distance. The Cepheid distance measurement technique is among the most accurate in astronomy with a precision of ten percent.
- published: 23 Jul 2010
- views: 1834
vid 7, Option E, Cepheid Variable Stars
- Order: Reorder
- Duration: 6:25
- Updated: 26 Feb 2012
- views: 3425
- published: 26 Feb 2012
- views: 3425
Louise Haiman -- Getaway Drive (Heinrich Müller Cepheid Variable Remodel)
- Order: Reorder
- Duration: 4:41
- Updated: 13 Oct 2015
- views: 810
Mick Welch - Cepheid Variable
- Order: Reorder
- Duration: 6:31
- Updated: 28 Jun 2015
- views: 356
*** If You are the one who owns a copyright for this track and you do not wish to have this kind of promotion on YouTube, please let me know and I will remove t...
*** If You are the one who owns a copyright for this track and you do not wish to have this kind of promotion on YouTube, please let me know and I will remove the video immediately. ***
More info about the track:
--------------------------------
Artist: Mick Welch
EP: Intergalactic Space Odyssey (2013)
Label: Inner Shift Music
http://www.discogs.com/Various-Intergalactic-Space-Odyssey/release/4655763
wn.com/Mick Welch Cepheid Variable
*** If You are the one who owns a copyright for this track and you do not wish to have this kind of promotion on YouTube, please let me know and I will remove the video immediately. ***
More info about the track:
--------------------------------
Artist: Mick Welch
EP: Intergalactic Space Odyssey (2013)
Label: Inner Shift Music
http://www.discogs.com/Various-Intergalactic-Space-Odyssey/release/4655763
- published: 28 Jun 2015
- views: 356
Kiritainment - Cepheid Variable [Original Song]
- Order: Reorder
- Duration: 5:40
- Updated: 24 Feb 2016
- views: 100
- published: 24 Feb 2016
- views: 100
Cepheid Variables.mp4
- Order: Reorder
- Duration: 6:45
- Updated: 10 Jun 2012
- views: 1391
Information about Cepheid Variables for GCSE astronomy
Visit www.astronomygcse.co.uk for more
- published: 10 Jun 2012
- views: 1391
Shag Harbor - Cepheid Variable (NEW SINGLE!)
- Order: Reorder
- Duration: 4:25
- Updated: 31 Oct 2012
- views: 4427
Official release of the first single from Shag Harbor's upcoming album "This World is Not Ours" available via Wartime Records.
Album Release Date: TBA
Faceboo...
Official release of the first single from Shag Harbor's upcoming album "This World is Not Ours" available via Wartime Records.
Album Release Date: TBA
Facebook: http://facebook.com/shagharbor
wn.com/Shag Harbor Cepheid Variable (New Single )
Official release of the first single from Shag Harbor's upcoming album "This World is Not Ours" available via Wartime Records.
Album Release Date: TBA
Facebook: http://facebook.com/shagharbor
- published: 31 Oct 2012
- views: 4427
Cepheid Variable Method
- Order: Reorder
- Duration: 3:11
- Updated: 31 Mar 2016
- views: 2
- published: 31 Mar 2016
- views: 2
Cepheid Variable Star Light Curve Analysis
- Order: Reorder
- Duration: 0:09
- Updated: 06 Jul 2009
- views: 1120
http://demonstrations.wolfram.com/CepheidVariableStarLightCurveAnalysis/
The Wolfram Demonstrations Project contains thousands of free interactive visualizat...
http://demonstrations.wolfram.com/CepheidVariableStarLightCurveAnalysis/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration analyzes a series of values for apparent magnitude (red band) versus time for a Cepheid variable star. The star has a period of 2.21138771 days based on a best fit of the signal. The x axis represents time folded at different period l...
Contributed by: Jeff Bryant
Based on work by: MACHO Project and Pavlos Protopapas (Harvard's Initiative in Innovative Computing)
wn.com/Cepheid Variable Star Light Curve Analysis
http://demonstrations.wolfram.com/CepheidVariableStarLightCurveAnalysis/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration analyzes a series of values for apparent magnitude (red band) versus time for a Cepheid variable star. The star has a period of 2.21138771 days based on a best fit of the signal. The x axis represents time folded at different period l...
Contributed by: Jeff Bryant
Based on work by: MACHO Project and Pavlos Protopapas (Harvard's Initiative in Innovative Computing)
- published: 06 Jul 2009
- views: 1120
Cosmology: twinkle twinkle little cepheid variable... young earth?
- Order: Reorder
- Duration: 5:49
- Updated: 13 Mar 2010
- views: 624
First off, I have no idea why the motion quality is so bad on the film, I'll check my hardware settings to see if there are any driver issues.
Second, the sc...
First off, I have no idea why the motion quality is so bad on the film, I'll check my hardware settings to see if there are any driver issues.
Second, the science:
Cepheids do play a vital part as 'standard candles' in determining the size of the Universe, but the details of their variations are not well understood.
Dr Penny said, "One hundred years ago Polaris varied by 10%, but over the last century the variations became smaller and smaller until ten years ago it only varied by 2%.
"The precision of distance measurements based on the period-luminosity relation depends primarily on the precision with which the distance of some Cepheid is known."
"[Polaris] has a period of 3.9696 days and varies .1 magnitudes in brightness, which is imperceptible by the human eye. Its period (and average luminosity, and the magnitude of its variation) have also changed substantially during the time they have been measured; this is unusual behavior for a Cepheid."
"The Cepheid variables are now divided into two subclasses, Population I or classical Cepheids, which are young, massive, metal-rich stars, and Population II or W Virginis Cepheids, which are older, fainter, metal-poor low-mass stars.[14] Population I and Population II Cepheids follow different period-luminosity relationships."
Hmmm, right, so what happens if there is a third category
of Cepheids that we don't know about that have different period-luminosity relationships again?
wn.com/Cosmology Twinkle Twinkle Little Cepheid Variable... Young Earth
First off, I have no idea why the motion quality is so bad on the film, I'll check my hardware settings to see if there are any driver issues.
Second, the science:
Cepheids do play a vital part as 'standard candles' in determining the size of the Universe, but the details of their variations are not well understood.
Dr Penny said, "One hundred years ago Polaris varied by 10%, but over the last century the variations became smaller and smaller until ten years ago it only varied by 2%.
"The precision of distance measurements based on the period-luminosity relation depends primarily on the precision with which the distance of some Cepheid is known."
"[Polaris] has a period of 3.9696 days and varies .1 magnitudes in brightness, which is imperceptible by the human eye. Its period (and average luminosity, and the magnitude of its variation) have also changed substantially during the time they have been measured; this is unusual behavior for a Cepheid."
"The Cepheid variables are now divided into two subclasses, Population I or classical Cepheids, which are young, massive, metal-rich stars, and Population II or W Virginis Cepheids, which are older, fainter, metal-poor low-mass stars.[14] Population I and Population II Cepheids follow different period-luminosity relationships."
Hmmm, right, so what happens if there is a third category
of Cepheids that we don't know about that have different period-luminosity relationships again?
- published: 13 Mar 2010
- views: 624
Milky Way, Dimensions, Cepheid Variables, Location of Center of Milky Way
- Order: Reorder
- Duration: 13:32
- Updated: 13 Apr 2015
- views: 95
This video discusses the dimensions of the Milky Way Galaxy. The Cepheid variable stars are discussed. The use of Cepheid variables as a standard candle is di...
This video discusses the dimensions of the Milky Way Galaxy. The Cepheid variable stars are discussed. The use of Cepheid variables as a standard candle is discussed. Shapley's determination of the location of the center of the Milky Way is discussed. This material relates to Chapter 14 of astronomynotes.com. Introductory Astronomy
Prof. Greg Clements
wn.com/Milky Way, Dimensions, Cepheid Variables, Location Of Center Of Milky Way
This video discusses the dimensions of the Milky Way Galaxy. The Cepheid variable stars are discussed. The use of Cepheid variables as a standard candle is discussed. Shapley's determination of the location of the center of the Milky Way is discussed. This material relates to Chapter 14 of astronomynotes.com. Introductory Astronomy
Prof. Greg Clements
- published: 13 Apr 2015
- views: 95
Classical Cepheid variable - Video Learning - WizScience.com
- Order: Reorder
- Duration: 2:15
- Updated: 10 Sep 2015
- views: 27
"Classical Cepheids" are a type of Cepheid variable star. They are population I variable stars that exhibit regular radial pulsations with periods of a few d...
"Classical Cepheids" are a type of Cepheid variable star. They are population I variable stars that exhibit regular radial pulsations with periods of a few days to a few weeks and visual amplitudes from a few tenths of a magnitude to about 2 magnitudes.
There exists a well-defined relationship between a classical Cepheid variable's luminosity and pulsation period, securing Cepheids as viable standard candles for establishing the Galactic and extragalactic distance scales. HST observations of classical Cepheid variables have enabled firmer constraints on Hubble's law. Classical Cepheids have also been used to clarify many characteristics of our galaxy, such as the Sun's height above the galactic plane and the Galaxy's local spiral structure.
Around 800 classical Cepheids are known in the Milky Way Galaxy, out of an expected total of over 6,000. Several thousand more are known in the Magellanic Clouds, with more known in other galaxies. The Hubble Space Telescope has identified classical Cepheids in NGC 4603, which is 100 million light years distant.
Classical Cepheid variables are 4–20 times more massive than the Sun, and around 1,000 to 50,000 times more luminous. Spectroscopically they are bright giants or low luminosity supergiants of spectral class F6 – K2, although the temperature and spectral type is variable. Their radii are a few tens to a few hundred times that of the sun. More luminous stars are cooler and larger. Along with the temperature changes their radii also change during each pulsation , resulting in brightness variations up to two magnitudes. The brightness changes are more pronounced at shorter wavelengths.
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Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK.
Background Music:
"The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library.
This video uses material/images from https://en.wikipedia.org/wiki/Classical+Cepheid+variable, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
Wiz Science™ is "the" learning channel for children and all ages.
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Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK.
Background Music:
"The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library.
This video uses material/images from https://en.wikipedia.org/wiki/Classical+Cepheid+variable, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
wn.com/Classical Cepheid Variable Video Learning Wizscience.Com
"Classical Cepheids" are a type of Cepheid variable star. They are population I variable stars that exhibit regular radial pulsations with periods of a few days to a few weeks and visual amplitudes from a few tenths of a magnitude to about 2 magnitudes.
There exists a well-defined relationship between a classical Cepheid variable's luminosity and pulsation period, securing Cepheids as viable standard candles for establishing the Galactic and extragalactic distance scales. HST observations of classical Cepheid variables have enabled firmer constraints on Hubble's law. Classical Cepheids have also been used to clarify many characteristics of our galaxy, such as the Sun's height above the galactic plane and the Galaxy's local spiral structure.
Around 800 classical Cepheids are known in the Milky Way Galaxy, out of an expected total of over 6,000. Several thousand more are known in the Magellanic Clouds, with more known in other galaxies. The Hubble Space Telescope has identified classical Cepheids in NGC 4603, which is 100 million light years distant.
Classical Cepheid variables are 4–20 times more massive than the Sun, and around 1,000 to 50,000 times more luminous. Spectroscopically they are bright giants or low luminosity supergiants of spectral class F6 – K2, although the temperature and spectral type is variable. Their radii are a few tens to a few hundred times that of the sun. More luminous stars are cooler and larger. Along with the temperature changes their radii also change during each pulsation , resulting in brightness variations up to two magnitudes. The brightness changes are more pronounced at shorter wavelengths.
Wiz Science™ is "the" learning channel for children and all ages.
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Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK.
Background Music:
"The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library.
This video uses material/images from https://en.wikipedia.org/wiki/Classical+Cepheid+variable, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
Wiz Science™ is "the" learning channel for children and all ages.
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Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK.
Background Music:
"The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library.
This video uses material/images from https://en.wikipedia.org/wiki/Classical+Cepheid+variable, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
- published: 10 Sep 2015
- views: 27
Cepheid Variable
- Order: Reorder
- Duration: 3:08
- Updated: 11 Jul 2014
- views: 51
Cepheid variable Meaning
- Order: Reorder
- Duration: 0:34
- Updated: 24 Apr 2015
- views: 36
Video shows what cepheid variable means. A radially pulsating (expanding and contracting) variable star with a regular period and known relationship between per...
Video shows what cepheid variable means. A radially pulsating (expanding and contracting) variable star with a regular period and known relationship between period and intrinsic brightness.. Cepheid variable Meaning. How to pronounce, definition audio dictionary. How to say cepheid variable. Powered by MaryTTS, Wiktionary
wn.com/Cepheid Variable Meaning
Video shows what cepheid variable means. A radially pulsating (expanding and contracting) variable star with a regular period and known relationship between period and intrinsic brightness.. Cepheid variable Meaning. How to pronounce, definition audio dictionary. How to say cepheid variable. Powered by MaryTTS, Wiktionary
- published: 24 Apr 2015
- views: 36
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9:23
Cepheid Variables 1
Cepheid Variables 1
More free lessons at: http://www.khanacademy.org/video?v=BWs-ONRDDG4
published: 30 Nov 2010
Cepheid Variables 1
Cepheid Variables 1
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- published: 30 Nov 2010
- views: 52746
12:34
Cosmic Distance Ladder: Cepheid Variables
An introduction to the class of variable stars known as Cepheid variables and their use as...
published: 10 Aug 2012
Cosmic Distance Ladder: Cepheid Variables
Cosmic Distance Ladder: Cepheid Variables
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- published: 10 Aug 2012
- views: 11556
0:48
Animation of a variable star
This artist's illustration shows a star turning into a variable star, expanding and shrink...
published: 17 Dec 2013
Animation of a variable star
Animation of a variable star
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- published: 17 Dec 2013
- views: 5024
14:17
Astrophysics - Distance - Cepheid variables (1/2) - (IB Physics, GCSE, A level, AP)
Cepheid variables, period/luminosity relation
For free videos and study notes, as well as...
published: 13 Oct 2012
Astrophysics - Distance - Cepheid variables (1/2) - (IB Physics, GCSE, A level, AP)
Astrophysics - Distance - Cepheid variables (1/2) - (IB Physics, GCSE, A level, AP)
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- published: 13 Oct 2012
- views: 2263
2:10
Cepheid variable - Video Learning - WizScience.com
A "Cepheid variable" is a star that pulsates radially, varying in both temperature and d...
published: 29 Sep 2015
Cepheid variable - Video Learning - WizScience.com
Cepheid variable - Video Learning - WizScience.com
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- published: 29 Sep 2015
- views: 131
3:55
Strange Case of the Pulsating Star
News from the Hubble Space Telescope, and Hubblecast. The great observatory has observed t...
published: 17 Dec 2013
Strange Case of the Pulsating Star
Strange Case of the Pulsating Star
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- published: 17 Dec 2013
- views: 57942
2:21
Determining Distances with Cepheid Variable Stars
Project about the history of Cepheids and how they are used to determine distances in the ...
published: 04 Apr 2014
Determining Distances with Cepheid Variable Stars
Determining Distances with Cepheid Variable Stars
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- published: 04 Apr 2014
- views: 1083
0:31
Cepheid Variable in Spiral Galaxy [720p]
A Cepheid is a star that varies in light intensity over regular, measurable periods. The p...
published: 16 Jun 2010
Cepheid Variable in Spiral Galaxy [720p]
Cepheid Variable in Spiral Galaxy [720p]
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- published: 16 Jun 2010
- views: 4345
6:49
the Cepheids
Henrietta Leavitt discovered the relation between the period and luminosity of cepheid var...
published: 09 Dec 2008
the Cepheids
the Cepheids
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0:56
Teach Astronomy - Distances from Cepheid Variables
http://www.teachastronomy.com/
Cepheid variables are luminous stars with variations in a r...
published: 23 Jul 2010
Teach Astronomy - Distances from Cepheid Variables
Teach Astronomy - Distances from Cepheid Variables
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- published: 23 Jul 2010
- views: 1834
6:25
vid 7, Option E, Cepheid Variable Stars
published: 26 Feb 2012
vid 7, Option E, Cepheid Variable Stars
vid 7, Option E, Cepheid Variable Stars
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- published: 26 Feb 2012
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4:41
Louise Haiman -- Getaway Drive (Heinrich Müller Cepheid Variable Remodel)
Louis Haiman – Aquatonic Dissonance
Abstract Forms – AFS 20 02
Vinyl, 12"
2015 , German...
published: 13 Oct 2015
Louise Haiman -- Getaway Drive (Heinrich Müller Cepheid Variable Remodel)
Louise Haiman -- Getaway Drive (Heinrich Müller Cepheid Variable Remodel)
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- views: 810
6:31
Mick Welch - Cepheid Variable
*** If You are the one who owns a copyright for this track and you do not wish to have thi...
published: 28 Jun 2015
Mick Welch - Cepheid Variable
Mick Welch - Cepheid Variable
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- published: 28 Jun 2015
- views: 356
5:40
Kiritainment - Cepheid Variable [Original Song]
published: 24 Feb 2016
Kiritainment - Cepheid Variable [Original Song]
Kiritainment - Cepheid Variable [Original Song]
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- published: 24 Feb 2016
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Cepheid Variables 1...
Cosmic Distance Ladder: Cepheid Variables...
Animation of a variable star...
Astrophysics - Distance - Cepheid variables (1/2) ...
Cepheid variable - Video Learning - WizScience.com...
Strange Case of the Pulsating Star...
Determining Distances with Cepheid Variable Stars...
![Cepheid Variable in Spiral Galaxy [720p]](http://web.archive.org./web/20160411003638/http://i.ytimg.com/vi/caYeTinG2GM/0.jpg)
Cepheid Variable in Spiral Galaxy [720p]...
the Cepheids...
Teach Astronomy - Distances from Cepheid Variables...
vid 7, Option E, Cepheid Variable Stars...
Louise Haiman -- Getaway Drive (Heinrich Müller Ce...
Mick Welch - Cepheid Variable...
![Kiritainment - Cepheid Variable [Original Song]](http://web.archive.org./web/20160411003638/http://i.ytimg.com/vi/GT6cZpvtYXs/0.jpg)
Kiritainment - Cepheid Variable [Original Song]...
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photo: AP / Jerome Delay
The world looks away as blood flows in Burundi
Edit The Guardian 10 Apr 2016
More than a quarter of a million people have fled in terror as opposition militias plot their return. Without international assistance a humanitarian disaster looms. Thierry wants to talk, but chokes on memories of blows and stabs punctuated by the sound of his father pleading for his life before masked men hacked him to death. He shrinks into himself, cold and small on a damp wooden bench just inside Tanzania ... “We can never go back.” ... ....
photo: NASA / Kim Shiflett
NASA's Planet-Hunting Kepler Probe Goes Into Emergency Mode
Edit NDTV 10 Apr 2016photo: NASA / NASA TV
SpaceX delivers world's first inflatable room to ISS
Edit Al Jazeera 10 Apr 2016
SpaceX has arrived at the International Space Station (ISS), delevering the world's first inflatable tent for astronauts. The US aerospace company's unmanned Dragon cargo ship, carrying lettuce seeds, lab mice and an inflatable pop-up room, arrived on Sunday at the space station where six spacecraft are now docked ... "It looks like we've caught a Dragon," said Peake ... Source. AFP. ....
photo: AP / Khalid Mohammed, File
Constant Repairs Required To Keep Iraqi Dam From Collapsing
Edit WorldNews.com 08 Apr 2016
At Iraq’s Mosul Dam, only one of the two bottom outlet gates is functioning, angrily spitting out water in a foamy white churn as birds fly above the spray, CNN reportsThe dam is considered by some experts to be among the most dangerous of its kind in the world. Completed in the mid-1980s, it was considered a necessity at the time ... – U.S. government. The lives of at least 1.5 million people could be at risk, according to U.S....
photo: creative commons /
Indonesian Singer Dies After Cobra Bites Her Onstage
Edit WorldNews.com 08 Apr 2016
An Indonesian pop star died Sunday after a king cobra, which was part of her act, bit her onstage, The Inquisitr reports. Irma Bule was famous for using venomous snakes and other reptiles, but one of her snakes fatally bit her, mid-performance ... The king cobra’s bite wasn’t supposed to sting, as the pop star was sure the snake was defanged ... She was usually partial to a boa or a python ... She was usually partial to a boa or a python....
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Cepheid Schedules 2016 First Quarter Results Announcement And Webcast (Cepheid Inc)
Edit Public Technologies 07 Apr 2016
Cepheid Inc). SUNNYVALE, Calif., April 7, 2016 /PRNewswire/ -- Cepheid (Nasdaq ... To access the live webcast, please visit Cepheid's website at http.//ir.cepheid.com ... About Cepheid. Based in Sunnyvale, Calif., Cepheid is a leading molecular diagnostics company that is dedicated to improving healthcare by developing, manufacturing, and marketing accurate yet easy-to-use molecular systems and tests ... corporate.communications@cepheid.com....
Cepheid Schedules 2016 First Quarter Results Announcement And Webcast
Edit PR Newswire 07 Apr 2016
SUNNYVALE, Calif., April 7, 2016 /PRNewswire/ -- Cepheid (Nasdaq. CPHD) today announced that it will report financial results for its 2016 first quarter on Thursday, April 28, 2016, after the close of the market. The Company will host a management presentation at 2 p.m. Pacific Time on ... ....
Astronomy’s Evolving Gender Dynamics
Edit The Atlantic 04 Apr 2016
A group of women computers, including Henrietta Swan Leavitt Wikimedia ... But although these issues are now being discussed in new ways, they are not new ... Even here, though, women astronomers made a place for themselves ... Studying telescopic data recorded on photographic plates taken at the Harvard College Observatory, Henrietta Swan Leavitt discovered the period-luminosity relationship that defines the stars known as Cepheid variables ... ....
Our Coverage Universe Sorted By Company Name (Valuentum Securities Inc)
Edit Public Technologies 31 Mar 2016
(Source. Valuentum Securities Inc). View Newsletter Archive-- view our actively-managed portfolios. Please find a list of our coverage universe of 16-page equity reports below. The companies are sorted by 'company name.' To access the report of your choosing, please use the 'Symbol' search box in our website header. If you have any questions or if we can be of any assistance, pleasecontact us ... C. R ... Cepheid CPHD Health Care Medical Devices....
Our Coverage Universe Sorted By Ticker Symbol (Valuentum Securities Inc)
Edit Public Technologies 31 Mar 2016
(Source. Valuentum Securities Inc). View Newsletter Archive-- view our actively-managed portfolios. Please find a list of our coverage universe of 16-page equity reports below. The companies are sorted by 'ticker symbol.' To access the report of your choosing, please use the 'Symbol' search box in our website header. If you have any questions or if we can be of any assistance, please contact us ... R ... CPHD Cepheid Health Care Medical Devices....
Automated Ebola blood test performs well in field evaluation
Edit Topix 30 Mar 2016
In a field evaluation study, Nira Pollock of Boston Children's Hospital and colleagues from Public Health England and Partners In Health found that the Cepheid GeneXpert Ebola assay provided results in near agreement with the standard laboratory test for both whole blood and cheek swab samples ... ....
Cepheid Announces European Approval Of Xpert MRSA Next Generation (NxG) Screening Test (Cepheid Inc)
Edit Public Technologies 29 Mar 2016
Cepheid Inc). SUNNYVALE, Calif., March 29, 2016 /PRNewswire/ -- Cepheid (Nasdaq ... About Cepheid ... All forward-looking statements and reasons why results might differ included in this release are made as of the date of this press release, based on information currently available to Cepheid, and Cepheid assumes no obligation to update any such forward-looking statement or reasons why results might differ ... SOURCE Cepheid. Cepheid Inc....
Cepheid Announces European Approval Of Xpert MRSA Next Generation (NxG) Screening Test
Edit PR Newswire 29 Mar 2016
SUNNYVALE, Calif., March 29, 2016 /PRNewswire/ -- Cepheid (Nasdaq. CPHD) today announced commercial availability, outside the United States, of Xpert® MRSA NxG, a next generation version of the market-leading molecular diagnostic test for Methicillin-Resistant Staphyloccus aureus ... ....
Cepheid Recognizes World TB Day 2016 With Delivery Of 5,000th GeneXpert System To Support Global ...
Edit PR Newswire 25 Mar 2016
SUNNYVALE, Calif., March 24, 2016 /PRNewswire/ -- Cepheid (Nasdaq. CPHD) today recognized World TB Day 2016 with the delivery of the 5,000th GeneXpert® System to be deployed as part of the company's shared commitment, with partners including the Foundation for Innovative New ... ....
Cepheid Recognizes World TB Day 2016 With Delivery Of 5,000th GeneXpert System To Support Global Fight Against Tuberculosis And Multi-Drug Resistant Tuberculosis (Cepheid Inc)
Edit Public Technologies 24 Mar 2016
Cepheid Inc). SUNNYVALE, Calif., March 24, 2016 /PRNewswire/ -- Cepheid (Nasdaq ... About Cepheid ... All forward-looking statements and reasons why results might differ included in this release are made as of the date of this press release, based on information currently available to Cepheid, and Cepheid assumes no obligation to update any such forward-looking statement or reasons why results might differ ... SOURCE Cepheid. Cepheid Inc....
The Goal of Ending TB is Within our Reach
Edit Huffington Post 24 Mar 2016
Today is World TB Day ... Government's Global TB Strategy. These plans call for the rapid adoption and expansion of new tools, medicines, and approaches to TB care ... By the end of 2016, the U.S ... USAID is partnering with Cepheid, a maker of molecular systems and tests, to find the missing 3.6 million TB cases earlier and accelerate the diagnosis of MDR-TB through increased access to rapid, accurate diagnostic tools ... Read More. ... 'Make it stop' ... ....
SunEdison Announces Ilan Daskal As Chief Financial Officer Designee
Edit Stockhouse 11 Mar 2016
Daskal, 50, is presently the interim chief financial officer of Aricent, a product engineering services company and a board member and chairman of the audit committee of Ixia, a leading provider of network testing, visibility, and security solutions. Prior to his current role, he acted as executive vice president and chief financial officer ......
SunEdison Announces Ilan Daskal As Chief Financial Officer Designee (SunEdison Inc)
Edit Public Technologies 11 Mar 2016
(Source. SunEdison Inc). MARYLAND HEIGHTS, Mo., March 11, 2016 /PRNewswire/ -- SunEdison, Inc. (NYSE ... Brian Wuebbels will remain SunEdison's chief financial officer until Daskal and SunEdison agree to remove the designee title ... 'Ilan brings to us a deep, successful broad-based finance track record ... Prior to his current role, he acted as executive vice president and chief financial officer of Cepheid, a molecular diagnostic company ... Mr ... R....
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