Zams Rotational Velocities of be Stars

Details Zams Rotational Velocities of be Stars Zams Rotational Velocities of be Stars

2005-09-07

arxiv.org/abs/astro-ph/0509175v1

Astronomy and Astrophysics

Astrophysics

Societe Francaise d'Astronomie et d'Astrophysique, France (2005)

Scientific paper

We show that Be stars belong to a high velocity tail of a single B-type star rotational velocity distribution in the main sequence (MS). We studied 127 galactic field Be stars and obtained their true equatorial velocity at the ZAMS using models of stellar evolution with rotation. There is a sharp mass-dependent cut in the ZAMS under which there is no Be star. Velocities above this cut follow a Gaussian-tail distribution. B stars with ZAMS rotational velocities lower than the cut probably cannot become Be.

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