Surface abundances of light elements for a large sample of early B-type stars - II. Basic parameters of 107 stars

Details Surface abundances of light elements for a large sample of early B-type stars - II. Basic parameters of 107 stars Surface abundances of light elements for a large sample of early B-type stars - II. Basic parameters of 107 stars

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.333....9l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 333, Issue 1, pp. 9-26.

Astronomy and Astrophysics

Astronomy

23

Stars: Atmospheres, Stars: Early-Type, Stars: Fundamental Parameters

Scientific paper

Effective temperatures Teff, surface gravities logg and interstellar extinctions AV are found for 107 B stars. Distances d of the stars, which are based on the derived Teff, logg and AV values, show good agreement with those obtained from the Hipparcos parallaxes. Comparing the Teff and logg values with evolutionary computations, we infer masses, radii, luminosities, ages and relative ages of the stars. Empirical relations between the Teff and logg parameters, on the one hand, and the photometric indices Q, [c1] and β, on the other hand, are constructed; these relations give a fast method for the Teff and logg estimation of early and medium B stars. Inclusion of the infrared J, H and K colours into the Teff, logg and AV determination shows that (i) the Teff and logg parameters are altered only slightly; (ii) the AV value is rather sensitive to these colours, so an accuracy better than 0.05mag in the JHK data is necessary for precise AV evaluation.

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