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词汇 cepheid
释义

Definition of cepheid in English:

cepheid

(also cepheid variable)
nounˈsɛːfɪɪdˈsiːfɪɪdˈsef-
Astronomy
  • A variable star having a regular cycle of brightness with a frequency related to its luminosity, so allowing estimation of its distance from the earth.

    〔天文〕造父变星

    Example sentencesExamples
    • Several hundred cepheid variables are known in our Galaxy.
    • Shapley also pointed out in that paper that the noted increase in the distance of the clouds explains the ‘failure of the persistent Harvard searches for cluster-type cepheids in the Magellanic Clouds and their globular clusters.’
    • The size and age of the expanding Universe is calculated by astronomers on the basis of winking stars called cepheids, the nearest of which is 1000-2000 light years away.
    • Using this, astronomers only needed to know the period of a cepheid variable to figure out how bright, and therefore how far away it was.
    • Type I cepheids are most closely associated with the thin disc and the spiral arm components of the Galaxy.

Origin

Early 20th century: from the name of the variable star Delta Cephei, which typifies this class of stars.

Definition of cepheid in US English:

cepheid

(also cepheid variable)
nounˈsef-
Astronomy
  • A variable star having a regular cycle of brightness with a frequency related to its luminosity, so allowing estimation of its distance from the earth.

    〔天文〕造父变星

    Example sentencesExamples
    • Using this, astronomers only needed to know the period of a cepheid variable to figure out how bright, and therefore how far away it was.
    • Several hundred cepheid variables are known in our Galaxy.
    • Shapley also pointed out in that paper that the noted increase in the distance of the clouds explains the ‘failure of the persistent Harvard searches for cluster-type cepheids in the Magellanic Clouds and their globular clusters.’
    • Type I cepheids are most closely associated with the thin disc and the spiral arm components of the Galaxy.
    • The size and age of the expanding Universe is calculated by astronomers on the basis of winking stars called cepheids, the nearest of which is 1000-2000 light years away.

Origin

Early 20th century: from the name of the variable star Delta Cephei, which typifies this class of stars.

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