单词 | RR Lyrae star |
释义 | RR Lyrae star Astron. 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. [ < NL: RR (variable star designation) of LYRA] |
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