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15 February 2025
 
  » arxiv » astro-ph/0112130

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RR Lyrae variables in Omega Centauri: a theoretical route
V. Castellani ; S. Degl’Innocenti ; M. Marconi ;
Date 6 Dec 2001
Subject astro-ph
AbstractWe present a theoretical approach to infer information about RR Lyrae variables from the morphology of their light curves. The method, already successfully applied to the field first overtone variable U Comae, is now tested on a RR$_{mathrm ab}$ variable in the globular cluster $omega$ Cen. We show that, with this method, it could be possible to give an estimate of the distance modulus of the cluster with an uncertainty not larger than $pm$0.1 mag. The predicted variable luminosity and mass are well within the range of theoretical evolutionary expectations giving the ``feeling’’ of a full compatibility between pulsational and evolutionary theory. However, before completely relying on the method, further tests are needed; the goal is that a well tested and well calibrated pulsational theory could provide reliable distance moduli from just one (or few) RR Lyrae stars.
Source arXiv, astro-ph/0112130
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