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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*
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.

Type
6. Disks
Copyright
Copyright © Astronomical Society of the Pacific 2000

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