Cepheid variable

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Related to Period-luminosity relationship: Cepheid variable star

Cepheid variable

(ˈsiːfɪɪd)
n
(Astronomy) astronomy any of a class of variable stars with regular cycles of variations in luminosity (most ranging from three to fifty days). There is a relationship between the periods of variation and the absolute magnitudes, which is used for measuring the distance of such stars

Ce′pheid var`iable


n.
a variable star with a short period of 1 to 50 days in which changes in brightness are due to alternations in volume.
[1900–05; Cephe (us) + -id1]
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References in periodicals archive ?
This period-luminosity relationship allows astronomers to use Cepheids as standard candles to judge distances.
Feast of the University of Cape Town in South Africa reexamined the period-luminosity relationship for Cepheids, using Hipparcos to measure the distances to 26 of the nearest such stars.
Since the same period-luminosity relationship likely applied to M31, but its Cepheids appeared so much dimmer and farther away, Hubble could announce the following year that M31 was definitely extragalactic--a spiral galaxy in its own right.
Henrietta Leavitt discovered this period-luminosity relationship in 1908 using a long run of old Harvard plates that covered wide fields.