Biparametric calibrations of stellar mass, radius and surface gravity using uvby-Hbeta_ photometry.

Details Biparametric calibrations of stellar mass, radius and surface gravity using uvby-Hbeta_ photometry. Biparametric calibrations of stellar mass, radius and surface gravity using uvby-Hbeta_ photometry.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327..207r&link_type=abstract

Astronomy and Astrophysics, v.327, p.207-214

Astronomy and Astrophysics

Astrophysics

19

Stars: Fundamental Parameters, Stars: Binaries: Eclipsing, Stars: Early-Type, Stars: Late-Type, Stars: General

Scientific paper

The aim of this study is to construct biparametric calibrations to estimate masses, radii and surface gravities for main-sequence stars using a photometric index related to effective temperature and another related to evolution. For this purpose, we used a sample of detached double-lined eclipsing binaries with accurate (=~1-2%) determinations of mass and radius and with available Stroemgren-Crawford photometry for the individual components of the binary system. The accuracies obtained, for the predicted dimensions when applied to single stars, are about 5-8% in mass, 10-15% in radius and 0.08-0.10dex in surface gravity for stars in the main sequence with T_eff_ in the range between 7000K and 20000K. Precisions are thus considerably better than those obtained through single-parameter calibrations (using spectral type, T_eff_ or one colour index), and comparable to those derived through model atmospheres and stellar evolutionary models, of much higher complexity.

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