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RR Lyrae is a variable star in the Lyra constellation. It is the prototype of the RR Lyrae variables star class. It has a period of about 13 hours, and oscillates between apparent ... - What is an RR Lyrae?
John C. Martin's RR Lyrae Research at Case Western Reserve University's Department of Astronomy ... The star RR Lyrae as it appears in the Deep Sky Survey What is an RR Lyrae? - RR Lyrae star
A short-period, yellow or white giant pulsating variable; RR Lyrae stars belong to Population II and are often found in globular clusters (hence one of their older names ...
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RR Lyrae Star
Encyclopedia Article
RR Lyrae Star, type of variable star (see Star), used in the determination of distances in astronomy. The name derives from the prototype star discovered in the constellation Lyra. Variations in brightness of RR Lyrae stars generally range in magnitude from 0.5 to 1.5, and it has been determined that they all have about the same absolute magnitude. The presence of such a star in a galaxy or globular cluster, therefore, helps establish the distance from earth of the galaxy or cluster.
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