Delta Cephei


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Delta Cephei

(see -fee-ÿ) See Cepheid variables.

Delta Cephei

[′del·tə ′sef·ē‚ī]
(astronomy)
A cepheid variable, from which the name of this type of star is derived; it has a period of 5.3 days.
References in periodicals archive ?
Examples of this behaviour are classified as delta Cephei, RR Lyrae and delta Scuti stars according to their position in the H-R diagram and the nature of their variation.
Delta Cephei variables have large amplitudes but long periods, typically many days, so if observing for a few hours each night it would take a long time to gather enough data to cover a complete pulsation cycle.
The star in the study is Delta Cephei, which is the namesake for the entire class of Cepheids and was discovered in 1784.
It is also home to two important variable stars; delta Cephei, prototype of the Cepheid variables, and mu Cephei, the semi-regular Garnet Star named by Sir William Herschel and one of the reddest naked eye stars in the sky (although this is totally lost on the colour-blind Director).