High and intermediate-resolution spectroscopy of Be stars

Abstract

We present an atlas of Hγ , He i lambda 4471 and Mg ii lambda 4481 line profiles obtained in a 10 year observation period of 116 Be stars, which enabled many of them to be observed at quite different emission epochs. From the best fit of the observed He i lambda 4471 line profiles with non-LTE, uniform (Teff,log g) and full limb-darkened model line profiles, we determined the V sin i of the program stars. To account, to some degree, for the line formation peculiarities related to the rapid rotation-induced non-uniform distributions of temperature and gravity on the stellar surface, the fit was achieved by considering (Teff,log g) as free parameters. This method produced V sin i estimations that correlate with the rotational velocities determined by Slettebak (1982) within a dispersion sigma