Properties of theoretical RRab light curves

Author(s)
M U Feuchtinger, Ernst Dorfi
Abstract

Using an adaptive radiation hydrodynamics code we have computed a grid of fundamental mode RR Lyrae models in order to give a detailed comparison to observed RR Lyrae light curves and to investigate the influence of several numerical parameters inherent to the computational method. The results can be summarized as follows: Concerning the comparison to observations the proposed solution of the well known RR Lyrae phase discrepancy in Feuchtinger & Dorfi (1996) is corroborated on the basis of more than 50 models. It is shown how the Fourier parameters vary during the crossings of the instability strip. Based on the large number of theoretical models we can study the properties of theoretical RRab light curves and e.g. state that no clear relation exists which links the fundamental stellar parameters to the low order Fourier coefficients. Investigating the long term evolution and me influence of several critical parameters like numerical viscosity, number of grid points or switching temperature between Lagrangian and adaptive grid, it turns out that the Fourier parameters arc essentially independent on the special choice of our numerical parameters.

Organisation(s)
Department of Astrophysics
External organisation(s)
University of Vienna
Journal
Astronomy & Astrophysics
Volume
322
Pages
817-824
No. of pages
8
ISSN
0004-6361
Publication date
1997
Peer reviewed
Yes
Austrian Fields of Science 2012
103003 Astronomy
Portal url
https://ucrisportal.univie.ac.at/en/publications/ac0260de-2013-45b5-90dc-00f86f2ad174