Cepheid variable


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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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Classified as a Cepheid variable, it is a supergiant star about 500 to 800 light-years from Earth.
Oscillations occur not only in mechanical systems but also in dynamic systems in virtually every area of science: for example the beating human heart, business cycles in economics, predator-prey population cycles in ecology, geothermal geysers in geology, vibrating strings in musical instruments, periodic firing of nerve cells in the brain, and the periodic swelling of Cepheid variable stars in astronomy.
This ladder's "bottom rung" is built on measurements to Cepheid variable stars that, because of their known brightness, have been used for more than a century to gauge the size of the observable universe.
Quantifying the shapes of Cepheid variable star light curves is a technique that has been in use for the past several decades.
Since the launch of NASA's Hubble Space Telescope in 1990, the team has observed 18 galaxies up to 65 million light years away and discovered almost 800 Cepheid variable stars, a special class of pulsating star used for accurate distance measurement.
We do not have an orbiting observatory that can examine Cepheid variable stars to determine the distance scale of the universe.
Astronomers want to determine the mass of Polaris, because it is the nearest Cepheid variable star.
We present analysis of two double model Cepheid variable stars, BQ Serpens and VX Puppis.
Caption: Astronomers measure distance to faraway galaxies--a key to the Hubble constant--by recording the brightness of supernovas and Cepheid variable stars.
It is one of the most luminous in the class of so-called Cepheid variable stars.
This portion of the electromagnetic spectrum has numerous advantages, especially when observing Cepheid variable stars, the so-called "standard candles" that are used to determine distances to distant galaxies.