2002A&A...387..187L -
Astronomy and Astrophysics, volume 387, 187-200 (2002/5-3)
A global jet/circulation model for young stars.
LERY T., HENRIKSEN R.N., FIEGE J.D., RAY T.P., FRANK A. and BACCIOTTI F.
Abstract (from CDS):
Powerful, highly collimated jets, surrounded by bipolar molecular outflows, are commonly observed near Young Stellar Objects (YSOs). In the usual theoretical picture of star formation, a jet is ejected from a magnetized accretion disk, with a molecular outflow being driven either by the jet or by a wider wind coming from the disk. Here, we propose an alternative global model for the flows surrounding YSOs. In addition to a central accretion-ejection engine driving the jet, the molecular outflow is powered by the infalling matter and follows a circulation pattern around the central object without necessarily being entrained by a jet. It is shown that the model produces a heated pressure-driven outflow with magneto-centrifugal acceleration and collimation. We report solutions for the three different parts of this self-similar model, i.e. the jet, the infalling envelope and the circulating matter that eventually forms the molecular outflow. This new picture of the accretion/outflow phase provides a possible explanation for several observed properties of YSO outflows. The most relevant ones are the presence of high mass molecular outflows around massive protostars, and a realistic fraction (typically 0.1) of the accretion flow that goes into the jet.
Abstract Copyright:
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Journal keyword(s):
stars: formation - methods: analytical - magnetohydrodynamics (MHD) - ISM: jets and outflows
Simbad objects:
10
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