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The slow winds of A-type supergiants

Published online by Cambridge University Press:  12 July 2011

Anahí Granada
Affiliation:
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina Instituto de Astrofísica La Plata, CCT La Plata-CONICET-UNLP, Argentina Observatoire de Genève. Université de Genève, Suisse
Michel Curé
Affiliation:
Universidad de Valparaíso, Chile
Lydia S. Cidale
Affiliation:
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina Instituto de Astrofísica La Plata, CCT La Plata-CONICET-UNLP, Argentina
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Abstract

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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 δ 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 conterparts.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

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