Delta Cephei (δ Cep / δ Cephei) is a binary star system approximately 891 light-years away in the constellation of Cepheus (the King).
Delta Cephei
A pulsating star in the constellation Cepheus. It was the second Cepheid discovered and lent its name to the entire class of stars.
Delta Del Stars ...
Delta Cephei,is a prototype for what are now called Cepheid variable stars. The study of stars such as these helps astronomers determine distance.
On the scale of largest-known stars, Cepheus boasts three in the top five! ...
Delta Cephei is a prototype for one of the more significant types of variables (see below). The star is also a very fine binary with a colour contrast.
[2327] delta Cephei or Alrediph or Al Radif ("the follower") is a interesting variable binary star with fine colour contrast. It is a fixed double star, with a yellow giant for its primary component and a blue companion with a visual magnitude of 7.5.
Measure Delta Cephei for a month Once students get the hang of it, they can find and measure the brightness of Delta Cephei in a few minutes. They should do this as many nights as possible over the course of a month.
Generally in each subgroup a fixed relation holds between period and absolute magnitude, as well as a relation between period and mean density of the star. They are yellow to red stars (spectral type A through M).
= Delta Cepheid variables
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The first, Delta Cephei, the prototype of the Cepheid variables, is among the most famed stars of the sky, while the second, Zeta Cep, ...
The first Cepheid Variable was Delta Cephei which was discovered in 1784 by the English astronomer John Goodricke, but their usefulness was not discovered until 1912 when Henrietta S.
The Cepheid Variables are named after the first one to be discovered: Delta Cepheid Cepheids have cycles that last a few days, and they vary by as much as two magnitudes.
" The Cepheid class takes its name from Delta Cephei, the first such star discovered in 1784.
(b) A class of stars named after Delta Cephei which vary in brightness over a regular period of time (typically a few days). The period of change is directly related to the true, average brightness or luminosity of the star.
The name comes from the prototype star Delta Cephei. Cepheids are important astronomically because there is a clear link between their luminosity and their period of variation.
Polaris A is a pulsating variable star of a type known as a Cepheid variable, after prototypical star of this type, Delta Cephei. Cepheid variables are bright, giant stars that show periodic variations in luminosity.
Its most celebrated star is Delta Cephei, a pulsating supergiant star that varies in brightness every 5.4 days. It is the prototype of the Cepheid variable stars that astronomers use for estimating distances in space.
Constellation Cepheus, the King and father of Andromeda -- southeast of Polaris (Alpha Ursae Minorus), northeast of Pi Cephei, Alfirk (Beta Cephei), Alderamin (Alpha Cephei), and the Garnet Star (Mu Cephei); north of Omicron, Iota, and Delta Cephei, ...
The prototype star is Delta Cephei, the variability of which was discovered by John Goodricke in 1784. In 1912 Henrietta Leavitt of Harvard Observatory discovered the aforementioned period-luminosity relationship of the Cepheids.
The luminosity is proportional to the period. Cepheid Variables may not be permanently variable; the fluctuations may just be an unstable phase the star is going through. and Delta Cephei are examples of Cepheids.
Following long-standing astronomical practice, the names come from the first star of each class to be discovered"in this case the variable star labeled RR in the constellation Lyra and the variable star Delta Cephei, ...
 See also: Delta, Delta Cep, Period, Cepheid, Distance
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