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

M. CURÉ, D. RIAL

ASTRONOMY AND ASTROPHYSICS

Año: 2004 vol. 428 p. 545 - 554

0004-6361

The topological analysis form Bjorkman (1995) for the standard model that describes the winds from hot stars by Castor, Abbott & Klein (1975) has been extended to iclude the effect of stellar rotation and changes in the ionization of the wind. The differential equation for the momentum of the wind is nonand transcendental for the velocity gradient. Due to this non-linearity the number of solutions that this equation possess is not know. 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 explicitely gien. 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 distinto de  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 almos the minimal