RR Lyrae

RR Lyrae is the prototype of a class of variables (that is, the ‘main’ star in that category, usually the first star discovered with its particular characteristics).
     RR Lyrae variables are very old giants which pulsate (that is their outer layer expands and contracts). Their period is quite short, less than one day. They usually inhabit globular clusters.

RR Lyrae has a period of 13h 36m and a range of one full magnitude, 7.1 to 8.1.

The star is north of eta, in the same field of view binoculars.

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© 1999-2014 by Richard Dibon-Smith.