Outflowing disk formation in B[e] supergiants due to rotation and bi--stability in radiation driven winds

Abstract

The effects of rapid rotation and bi-stability upon the density contrast between the equatorial and polar directions of a B[e] supergiant are re-investigated. Based upon a new slow solution for different high rotational radiation driven winds (Curé 2004) and the fact that bi--stability allows a change in the line--force parameters ($α$, $k$, and $δ$), the equatorial densities are about $10^2$--$10^4$ times higher than the polar ones. These values are in qualitative agreement with the observations.

5 pages, 5 figures, Accepted for publication in Astronomy & Astrophysics