Predicted and empirical radii of RR Lyrae stars

Details Predicted and empirical radii of RR Lyrae stars Predicted and empirical radii of RR Lyrae stars

2005-03-17

arxiv.org/abs/astro-ph/0503382v1

Astrophys.J. 623 (2005) L133-L136

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures, accepted on ApJ Letters

Scientific paper

10.1086/430273

We present new theoretical Period-Radius-Metallicity (PRZ) relations for RR Lyrae stars. Current predictions are based on a large set of nonlinear, convective models that cover a broad range of chemical abundances and input parameters. We also provide new and homogeneous estimates of angular diameters for a sample of field RR Lyrae stars using a recent calibration of the Barnes-Evans surface brightness relation. Predicted and empirical radii are, within the errors, in reasonable agreement, but in the short-period range the latter present a larger scatter. As a working hypothesis we suggest that this discrepancy might be due to the occurrence either of nonlinear features such as bumps or a steep rising branch. New distance determination for RR Lyr itself is in very good agreement with HST trigonometric parallax and with pulsation parallax.

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