Physical Parameters of RR Lyrae Stars from Multicolor Photometry and Kurucz Atmospheric Models

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Photometric, Polarimetric, And Spectroscopic Instrumentation, Cepheids, Quasars, Active Or Peculiar Galaxies, Objects, And Systems

Scientific paper

The most comprehensive photometric material exists for RR Lyrae (RRL) stars in the Johnson-Cousins system UBV (RI)C. In this system the colors of the Kurucz atmospheric models are available allowing to determine the effective temperature and surface gravity as a function of phase. Using the UBV (RI)C photometry of the RRab star SU Dra as an example we determine the phase intervals where the quasi-static atmosphere approximation (QSAA) is valid, i.e. where the Kurucz atmospheric models do reproduce the observed UBV (RI)C colors sufficiently. From the phases where QSAA is a good approximation we determine metallicity and interstellar reddening of SU Dra.

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