ACCURACY OF EFFECTIVE TEMPERATURES OF SOLAR CHEMICAL-COMPOSITION STARS DERIVED FROM THE FLUX FITTING METHOD

We discuss the uncertainties affecting the determinations of effective temperature and apparent angular diameters based on the flux fitting method. We use Kurucz model fluxes and the spectrophotometric scans gi ven in Breger Catalog. In particular, we analyze and discuss the influ ence of indetermination which may affect the fixed secondary parameter s (i.e. surface gravity, overall metallicity, and interstellar reddeni ng correction) on the estimates of the fitted parameters, T-eff and ph i. The role of different sources of data for the same star and of each of the above mentioned parameters is described in detail for five rep resentative stars, while 130 non-supergiant solar chemical composition stars, in the spectral range G8 - B0, are used to quantitatively illu strate the statistical behaviour of uncertainties.