The Slow Winds of A-Type Supergiants

Details The Slow Winds of A-Type Supergiants The Slow Winds of A-Type Supergiants

2010-09-27

arxiv.org/abs/1009.5350v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

2 pages, to appear in the proceedings of the IAUS 272 on "Active OB stars: structure, evolution, mass loss and critical limits

Scientific paper

The line driven- and rotation modulated-wind theory predicts an alternative slow solution, besides from the standard m-CAK solution, when the rotational velocity is close to the critical velocity. We study the behaviour of the winds of A-type supergiants (Asg) and show that under particular conditions, e.g., when the \delta line-force parameter is about 0.25, the slow solution could exist over the whole star, even for the cases when the rotational speed is slow or zero. We discuss density and velocity profiles as well as possible observational counterparts.

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