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

Effective temperatures T (eff) , surface gravities log g and interstellar extinctions A (V) are found for 107 B stars. Distances d of the stars, which are based on the derived T (eff) , log g and A (V) values, show good agreement with those obtained from the Hipparcos parallaxes. Comparing the T (eff) and log g values with evolutionary computations, we infer masses, radii, luminosities, ages and relative ages of the stars. Empirical relations between the T (eff) and log g parameters, on the one hand, and the photometric indices Q , [c (1) ] and beta , on the other hand, are constructed; these relations give a fast method for the T (eff) and log g estimation of early and medium B stars. Inclusion of the infrared J , H and K colours into the T (eff) , log g and A (V) determination shows that (i) the T (eff) and log g parameters are altered only slightly; (ii) the A (V) value is rather sensitive to these colours, so an accuracy better than 0.05 mag in the JHK data is necessary for precise A (V) evaluation.