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The Period-Luminosity Relation

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The Period-Luminosity Relation
The period of a Cepheid variable is directly related to its average luminosity: The more luminous the Cepheid, the longer its
period and the slower its pulsations. Type I Cepheids (δ Cephei stars) are brighter, more massive, and more metal-rich stars
than Type II Cepheids. The greater brightness of the Type I Cepheids is a result of their higher mass
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