The RR Lyrae U Com as a test for nonlinear pulsation models

Details The RR Lyrae U Com as a test for nonlinear pulsation models The RR Lyrae U Com as a test for nonlinear pulsation models

2000-02-11

arxiv.org/abs/astro-ph/0002242v1

Astronomy and Astrophysics

Astrophysics

10 pages, 4 postscript figures, accepted for publication on ApJ Letters

Scientific paper

10.1086/312582

We use high precision multiband photometric data of the first overtone RR Lyrae U Com to investigate the predictive capability of full amplitude, nonlinear, convective hydrodynamical models. The main outcome of this investigation is that theoretical predictions properly account for the luminosity variations along a full pulsation cycle. Moreover, we find that this approach, due to the strong dependence of this observable and of the pulsation period on stellar parameters, supply tight constraints on stellar mass, effective temperature, and distance modulus. Pulsational estimates of these parameters appear in good agreement with empirical ones. Finally, the occurrence of a well-defined bump just before the luminosity maximum gave the unique opportunity to calibrate the turbulent convection model adopted for handling the coupling between pulsation and convection.

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