Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-26
Astronomy and Astrophysics
Astrophysics
5 Pages, Proceedings of "The Interaction of Stars with their Environment II", Budapest, Hungary May 15-18, 2002
Scientific paper
The time of protostellar wind breakout may be determined by the evolution of the infalling flow, rather than any sudden change in the central engine. I examine the transition from pure infall to outflow, in the context of the inside-out collapse of a rotating molecular cloud core. I have followed numerically the motion of the shocked shell created by the impact of a stellar wind and infalling gas. These fully time-dependent calculations include cases both where the shell falls back to the stellar surface, and where it breaks out as a true outflow. Assuming a wind launched from the protostellar surface, the breakout time is determined in terms of the parameters describing the wind (Mdot_w, V_w) and collapsing cloud core (a_0, Omega). The trapped wind phase consists of a wind sufficiently strong to push material back from the stellar surface, but too weak to carry the heavy, shocked infall out of the star's gravitational potential. To produce a large-scale outflow, the shocked material must be able to climb out of the star's gravitational potential well, carrying with it the dense, swept-up infall.
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