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New Radiation Driven Wind Solutions Including Stellar Rotation: Applicability to Be stars

Published online by Cambridge University Press:  12 April 2016

Michel Curé
Michel Curé*
Affiliation:
Departamento de Física y Meteorologia, Universidad de Valparaíso, Chile

Abstract

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The theory of radiative-line driven wind including stellar rotation is re-examined. After a suitable change of variables, new analytical equations for the mass loss rate and position of the critical point are derived. A non-linear equation for the position of the critical point is obtained, in order to solve it, a β-field is used, and in addition to the standard CAK critical point two other critical points as function of star’s rotational speed (Vϕ ) are founded. When the stellar rotation velocity is approximate or greater than 0.8 × Vbreak–up , the CAK critical point is located far away in the wind (r > 4R *) and there we have again only one critical point. Numerical solutions from this new critical point are obtained, they have very low terminal velocities (approx. 400 km/sec). The applicability of this new solution in the frame of Be stars are discussed.

Information

Type
6. Disks
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 636 - 639
Copyright
Copyright © Astronomical Society of the Pacific 2000

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