EAS Publications Series
Volume 3, 2002Star Formation and the Physics of Young Stars: Summer school on Stellar Physics X
|Page(s)||229 - 277|
|Published online||25 September 2002|
J. Bouvier and J.-P. Zahn (eds)
EAS Publications Series, 3 (2002) 229-277
Theory of magnetized accretion discs driving jets
Laboratoire d'Astrophysique de l'Observatoire de Grenoble, France
In this lecture I review the theory of magnetized accretion discs driving jets, with a focus on Young Stellar Objects (YSOs). I first introduce observational and theoretical arguments in favor of the "disc wind" paradigm. There, accretion and ejection are interdependent, requiring therefore to revisit the standard picture of accretion discs. A simple magnetostatic approach is shown to already provide some insights into the basic phenomena. The magnetohydrodynamic equations as well as all usual assumptions are then clearly listed. The relevant physical mechanisms of steady-state accretion and ejection from discs are explained in a model independent way. The results of self-similar calculations are shown and critically discussed, for both cold and warm jet configurations. I finally provide observational predictions and the physical conditions required in YSOs discs. The need for introducing a magnetospheric interaction between the disc and the protostar is briefly discussed.
© EAS, EDP Sciences, 2002
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