RR Lyrae variable

H-R diagram for globular cluster M5, with the horizontal branch marked in yellow and known RR Lyrae stars in green

RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and are used as standard candles to measure (extra)galactic distances.

This type of variable is named after the prototype, the variable star RR Lyrae in the constellation Lyra.

单词	RR Lyrae star
释义	RR Lyrae star 英语百科 RR Lyrae variable RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and are used as standard candles to measure (extra)galactic distances. This type of variable is named after the prototype, the variable star RR Lyrae in the constellation Lyra.
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RR Lyrae star

RR Lyrae variable