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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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| He also explores variable stars such as Cepheids, red giants, and eruptive stars. As a cosmic yardstick for measuring the distances to galaxies, Cepheids have proven invaluable. Those estimates, based on Cepheids and three other distance indicators, are accurate within 10 percent, she says. |
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