A disc-wind model with correct crossing of all magnetohydrodynamic critical surfaces

被引:91
作者
Vlahakis, N
Tsinganos, K
Sauty, C
Trussoni, E
机构
[1] Univ Crete, Dept Phys, GR-71003 Iraklion, Crete, Greece
[2] Univ Paris 07, Observ Paris, DAEC, F-92190 Meudon, France
[3] Osserv Astron Torino, I-10025 Pino Torinese, Italy
关键词
MHD; plasmas; solar wind; stars : mass-loss; ISM : jets and outflows; galaxies : jets;
D O I
10.1046/j.1365-8711.2000.03703.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The classical Blandford & Payne model for the magneto-centrifugal acceleration and collimation of a disc-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 disc winds associated with young stellar objects is briefly discussed.
引用
收藏
页码:417 / 428
页数:12
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