Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-22
Astrophys.J. 614 (2004) 929-941
Astronomy and Astrophysics
Astrophysics
40 pages, 15 figures, Accepted for publication in ApJ
Scientific paper
10.1086/423776
The theory of radiation driven wind including stellar rotation is re-examined. After a suitable change of variables, a new equation for the mass loss rate is derived analytically. The solution of this equation remains within 1% confidence when compared with numerical solutions. Also, a non-linear equation for the position of the critical (singular) point is obtained. This equation shows the existence of an additional critical point, besides the standard m--CAK critical point. For a stellar rotation velocity larger than aprox. 0.7 - 0.8 V_{breakup}, there exists only one critical point, located away from the star's surface. Numerical solutions crossing through this new critical point, are attained. In these cases, the wind has a very low terminal velocity and therefore a higher density wind. Disk formation in Be stars is discussed in the frame of this new line driven stellar wind solution.
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