Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-12-06
Astronomy and Astrophysics
Astrophysics
11 pages with 9 eps figs, newpasp.sty, to be published in the "Omega Centauri: a Unique Window into Astrophysics" (Cambridge,
Scientific paper
We 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.
Castellani Vittorio
Degl'Innocenti Scilla
Marconi Marcella
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