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

  • Michel Curé (a1)

Abstract

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.

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References

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

  • Michel Curé (a1)

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