Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-30
Mon.Not.Roy.Astron.Soc. 318 (2000) 417
Astronomy and Astrophysics
Astrophysics
13 pages, MNRAS accepted for publication
Scientific paper
The classical Blandford & Payne (1982) model for the magnetocentrifugal acceleration and collimation of a disk-wind is revisited and refined. In the original model, the gas is cold and the solution is everywhere subfast magnetosonic. In the present model the plasma has a finite temperature and the self-consistent solution of the MHD equations starts with a subslow magnetosonic speed which subsequently crosses all critical points, at the slow magnetosonic, Alfven and fast magnetosonic separatrix surfaces. The superfast magnetosonic solution thus satisfies MHD causality. Downstream of the fast magnetosonic critical point the poloidal streamlines overfocus towards the axis and the solution is terminated. The validity of the model to disk winds associated with young stellar objects is briefly discussed. ~
Sauty Christophe
Trussoni Edoardo
Tsinganos Kanaris
Vlahakis Nektarios
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