Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-17
Astronomy and Astrophysics
Astrophysics
6 pages, figures included. To appear in "The Origins of Stars and Planets: The VLT View". J. Alves and M. McCaughrean, editors
Scientific paper
10.1007/10856518_33
Protostellar jets and winds are probably driven magnetocentrifugally from the surface of accretion disks close to the central stellar objects. The exact launching conditions on the disk, such as the distributions of magnetic flux and mass ejection rate, are poorly unknown. They could be constrained from observations at large distances, provided that a robust model is available to link the observable properties of the jets and winds at the large distances to the conditions at the base of the flow. We discuss the difficulties in constructing such large-scale wind models, and describe a novel technique which enables us to numerically follow the acceleration and propagation of the wind from the disk surface to arbitrarily large distances and the collimation of part of the wind into a dense, narrow ``jet'' around the rotation axis. Special attention is paid to the shape of the jet and its mass flux relative to that of the whole wind. The mass flux ratio is a measure of the jet formation efficiency.
Blandford Roger. D.
Krasnopolsky Ruben
Li Zhi-Yun
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