Period changes in omega Centauri RR Lyrae stars

Details Period changes in omega Centauri RR Lyrae stars Period changes in omega Centauri RR Lyrae stars

2000-09-30

arxiv.org/abs/astro-ph/0010005v1

Astronomy and Astrophysics

Astrophysics

23 pages (LaTeX text and tables); 25 figures(.gif), to appear in AJ

Scientific paper

10.1086/318746

A century of observations of omega Centauri allows us to accurately follow the period changes of a large sample of variable stars. Although the period changes are composed of monotone and irregular changes, period increases dominate in most of the RRab stars. The typical period increase rates are of the same order of magnitude as model calculations predict for the evolved, redward phase of horizontal branch evolution. For the 44 well observed RRab stars which show monotonic period changes, a mean rate of 0.15 d/Myr has been found. The period changes of the first overtone RRc type stars show a much more complex, irregular behavior.

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