The RR Lyrae Star U Comae as a Test for Nonlinear Pulsation Models
Open Access
- 1 April 2000
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 532 (2), L129-L132
- https://doi.org/10.1086/312582
Abstract
We use high-precision multiband photometric data of the first-overtone RR Lyrae star U Comae 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, because of the strong dependence of this observable and of the pulsation period on stellar parameters, supplies tight constraints on stellar mass, effective temperature, and distance modulus. Pulsational estimates of these parameters appear in good agreement with empirical ones. Finally, 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.Keywords
This publication has 28 references indexed in Scilit:
- RR Lyrae variables in M5 as a test of pulsational theoryMonthly Notices of the Royal Astronomical Society, 1999
- Classical Cepheid Pulsation Models. I. Physical StructureThe Astrophysical Journal Supplement Series, 1999
- Evolution of Population II starsThe Astronomy and Astrophysics Review, 1998
- Nonlinear investigation of the pulsational properties of RR Lyrae variablesAstronomy and Astrophysics Supplement Series, 1997
- Double-Mode RR Lyrae Variables: Pulsational Masses RevisitedThe Astrophysical Journal, 1996
- Metallicity Effects on RR Lyrae VariablesThe Astrophysical Journal, 1996
- CCD Photometry of RR Lyrae Stars in M5 as a Test for the Pulsational ScenarioThe Astronomical Journal, 1996
- The Distance to the Galactic Center Obtained by Infrared Photometry of RR Lyrae VariablesThe Astronomical Journal, 1995
- Pulsation and stability of RR Lyrae stars. 1: Instability stripThe Astrophysical Journal Supplement Series, 1994
- On the absolute magnitudes of RR Lyrae starsThe Astrophysical Journal, 1986