The influence of rotation in radiation driven winds from hot stars II. CAK topological analysis

Abstract

The topological analysis from Bjorkman (1995) for the standard model that describes the winds from hot stars by Castor, Abbott & Klein (1975) has been extended to include the effect of stellar rotation and changes in the ionization of the wind. The differential equation for the momentum of the wind is non--linear and transcendental for the velocity gradient. Due to this non--linearity the number of solutions that this equation possess is not known. After a change of variables and the introduction of a new physically meaningless independent variable, we manage to replace the non--linear momentum differential equation by a system of differential equations where all the derivatives are {\it{explicitely}} given. We then use this system of equations to study the topology of the rotating--CAK model. For the particular case when the wind is frozen in ionization ($\delta =0$) only one physical solution is found, the standard CAK solution, with a X--type singular point. For the more general case ($\delta \ne 0$), besides the standard CAK singular point, we find a second singular point which is focal--type (or attractor). We find also, that the wind does not adopt the maximal mass--loss rate but almost the minimal.

arXiv comment11 pages, Astronomy and Astrophysics Accepted

References in corpus (4)

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• Evolution of stars with 60 and 200 Msun: predictions for WNh stars in the Milky Way
• Revisiting Viscous Transonic Decretion Disks of Be Stars
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