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Astron. Astrophys. 322, 147-154 (1997)

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Age and mass of main sequence A-Type stars

R. Asiain , J. Torra and F. Figueras

Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Avda. Diagonal 647, E-08028, Barcelona, Spain

Received 16 July 1996 / Accepted 20 November 1996


We study the individual assignation of stellar ages and masses of Main Sequence A type stars from Strömgren photometry and stellar evolutionary models. A detailed evaluation of the errors involved in the determination of these parameters is also presented; the range where typical errors are found is 10-30% in age, and 7-15% in mass.

A test using accurate data on fundamental parameters of detached, double lined eclipsing binary systems allows us to evaluate the efficiency of several sets of recent stellar evolutionary models in describing A type stars. The models that consider the overshooting effect on the convective layers have been found to be the most realistic.

Key words: stars: fundamental parameters – stars: HR diagram – stars: evolution – stars: early-type

Send offprint requests to: R. Asiain

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998