Cepheids

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A Cepheid variable () is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude. A strong direct relationship between a Cepheid variable's luminosity and pulsation period established Cepheids as important indicators of cosmic benchmarks for scaling galactic and extragalactic distances. This robust characteristic of classical Cepheids was discovered in 1908 by Henrietta Swan Leavitt after studying thousands of variable stars in the Magellanic Clouds. This discovery allows one to know the true luminosity of a Cepheid by simply observing its pulsation period. This in turn allows one to determine the distance to the star, by comparing its known luminosity to its observed brightness. The term Cepheid originates from Delta Cephei in the constellation Cepheus, identified by John Goodricke in 1784, the first of its type to be so identified..

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  • Plural form of cepheid. noun

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Pulsating stars (so-called cepheids) have long been used as one of the best means to determine distances in astronomy.. [Conscientious: Science: February 2008 Archives]

M31 offers an excellent chance to study more typical disk populations, in a manner which might be extended to more distant galaxies where such variables are still visible, probing a much more evenly spread progenitor age distribution than cepheids {and perhaps useful as a distance scale alternative or cross-check}.. [SpaceRef Top Stories]

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SALT_Astro
SALT_Astro
2019-01-19

Spectroscopic investigations of Cepheids and stars belonging to Galactic open clusters

Astrobotweet
Astrobotweet
2019-01-19

Galaxy rotation curve from classical Cepheids. (arXiv:1809.01951v2 [ ] UPDATED)

RTB_HRoss
RTB_HRoss
2019-01-19

Cosmic creation: Astronomers achieve a geometric distance measure to a Cepheid variable star accurate to 1%, a fact…

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Cepheid variables 1 | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Cepheid variables 1 | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Why cepheids pulsate | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Why cepheids pulsate | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Cepheid Variable Stars and Distance Measurement in Space - Space Engine
Cepheid Variable Stars and Distance Measurement in Space - Space Engine

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Cepheids

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