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Cepheid |
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Cepheid [′sē·fē·əd] (astronomy) One of a subgroup of periodic variable stars whose brightness does not remain constant with time and whose period of variation is a function of intrinsic mean brightness. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Polaris is the nearest known Cepheid variable, a type of star used to measure the distances to other galaxies and the rate of expansion of the universe. Bought: AOL Time Warner, 100 shares; Sold: Cepheid, 100 shares In 1923, while observing the Andromeda nebula, he found that it contained a Cepheid variable, a star that regularly varies in brightness. |
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