period-luminosity relation
Americannoun
Etymology
Origin of period-luminosity relation
First recorded in 1945–50
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Cepheids are scattered throughout our own Milky Way Galaxy, but the period-luminosity relation was discovered from observations of the Magellanic Clouds, a satellite galaxy now known to be about 160,000 light-years away.
From Textbooks ● Oct. 13, 2016
For example, the relationships we have described such as the period-luminosity relation for certain variable stars aren’t exactly straight lines on a graph.
From Textbooks ● Oct. 13, 2016
RR Lyrae stars can be used as standard bulbs, and cepheid variables obey a period-luminosity relation, so measuring their periods can tell us their luminosities.
From Textbooks ● Oct. 13, 2016
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.
From Scientific American ● Feb. 10, 2012
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