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Matrix Software > Learng Astrology > Astrophysical Directions > Galactic Objects > RR Lyrae Stars

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RR Lyrae Stars

RR Lyrae stars were first known as Cluster-type Variables, since they were discovered (in large numbers) in the high velocity globular clusters. RR Lyrae stars have absolute magnitudes near zero and spectral types near class A5. These stars are pulsating stars of very short period (usually less than one day) and only a slight dependence exists between period and luminosity, unlike the Cepheids. RR Lyrae stars (named after the star RR Lyrae, one of the brightest in this group) are very numerous in our galaxy, but are too faint to be seen in any but the nearest of the external galaxies. Some have been observed in the dwarf system in Sculptor and the Magellanic Clouds. RR Lyrae stars posses a high velocity motion that associates them with objects in the nucleus of our galaxy and other dust-free regions of space. As mentioned, they were first discovered in large numbers in globular clusters, which are very old and relatively free of interstellar dust.





Copyright (c) 1997-99 Michael Erlewine


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