| 释义 |
Cepheid, a. and n. Astr.|ˈsɛfɪɪd, ˈsiːfɪɪd|
Also cepheid.
[f. L. Cēpheus, Gr. κηϕεύς Cepheus, a mythical king whose name was given to a constellation + -id2.]
A. adj. Pertaining to or resembling the variable star δ Cephei.
B. n. A variable star of the type of δ Cephei.
1904Astrophysical Jrnl. XX. 184 Spectroscopic studies of Cepheid variables. 1921Discovery Feb. 38/1 To determine the absolute magnitude..of every Cepheid variable in the heavens. 1927Glasgow Herald 7 Oct. 11/2 When a Cepheid's period was noted its brightness could be stated. 1927A. S. Eddington Stars & Atoms 93 In 1924 Hubble discovered a number of Cepheid variables in the great Andromeda nebula. 1964Yearbk. Astr. 1965 149 It has been found that the longer the period of a Cepheid, the greater its real luminosity. If one knows how bright a star really is and how bright it appears, one can at once deduce its distance. Cepheids therefore act as standard candles among the stars. |