Definitions for cepheid variable
cephei·d vari·able

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1. cepheid variablenoun

   A radially pulsating (expanding and contracting) variable star with a regular period and known relationship between period and intrinsic brightness.

2. Etymology: From Cepheus, the name of the constellation in which such stars were first discovered.

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1. Cepheid variable

   A Cepheid variable () is a type of variable star that pulsates radially, varying in both diameter and temperature. It changes in brightness, with a well-defined stable period and amplitude. Cepheids are important cosmic benchmarks for scaling galactic and extragalactic distances. A strong direct relationship exists between a Cepheid variable's luminosity and its pulsation period. This characteristic of classical Cepheids was discovered in 1908 by Henrietta Swan Leavitt after studying thousands of variable stars in the Magellanic Clouds. The discovery allows one to know the true luminosity of a Cepheid by just observing its pulsation period. This tells one 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. It was the first of its type to be identified. The mechanics of stellar pulsation as a heat-engine was proposed in 1917 by Arthur Stanley Eddington (who wrote at length on the dynamics of Cepheids). It was not until 1953 that S. A. Zhevakin identified ionized helium as a likely valve for the engine.

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1. Cepheid variable

   A Cepheid 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.

How to pronounce cepheid variable?

1. Alex

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   David

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   Mark

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   Daniel

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   Libby

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How to say cepheid variable in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of cepheid variable in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of cepheid variable in Pythagorean Numerology is: 3

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Cepheid_Variable
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Cepheid_Variable
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=cepheid variable