PERIOD-LUMINOSITY RELATION Definition & Meaning

period-luminosity relation

[ peer-ee-uhd-loo-muh-nos-i-tee ]

Phonetic (Standard)IPA

noun

Astronomy.

the relationship between the period of light variation and of the absolute magnitude of Cepheid variable stars.

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�y��vlog History and Origins

Origin of period-luminosity relation¹

First recorded in 1945–50

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Example Sentences

Examples have not been reviewed.

Hubble was able to use his measurement of Cepheids and Leavitt’s period-luminosity relation to prove definitively that the Cepheids in Andromeda and several other nebulae were much too distant to be inside the Milky Way.

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