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cluster variable

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Cluster
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Cluster
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RR Lyrae star

 
–noun
Astronomy. one of a group of pulsating variable stars found in the halo of the Milky Way, with periods between 1.2 and 30 hours; all have approximately the same luminosity and are therefore used for measuring distances.
Also called cluster variable.

Origin:
< NL: RR (variable star designation) of Lyra
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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