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Cepheid variable

A Cepheid variable or Cepheid is a member of a particular class of variable stars, notable for a fairly tight correlation between their period of variability and absolute luminosity.

Since the period-luminosity relation can be calibrated with great precision using the nearest Cepheid stars, the distances found with this method are among the most accurate available.

Note:   The above text is excerpted from the Wikipedia article "Cepheid variable", which has been released under the GNU Free Documentation License.
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August 2, 2015

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