Simultaneous solutions of stellar parameters (Teff, [Fe/H]) from synthetic uvby Stromgren photometry

Abstract

The comprehensive knowledge of fundamental parameters of single stars is the basis of the modelling of star clusters and galaxies. Most fundamental stellar parameters of the individual components in SB2 eclipsing binaries are known with very high accuracy. Unfortunately, while masses and radii are well determined, the temperatures strongly depend on photometric calibrations. In the present work, we have used an empirically-calibrated grid of theoretical stellar spectra (BaSeL models) for simultaneously deriving homogeneous effective temperatures and metallicities from observed data. For this purpose, we have selected 20 binary systems (40 stars) for which we have uvby Stromgren photometry with estimated errors (see Lastennet et al., astro-ph/9811103, for details).