Abstract
In this paper, we first revisit Parker's hydrodynamic model for a stellar
wind and make further analytic considerations. We show that the visualization
of an effective de Laval type nozzle associated with Parker's model is valid
only in a superficial sense and not on the dynamical level. We then make an
analytic considerations on the Weber-Davis magnetohydrodynamic (MHD) extension
of Parker's model with a view to provide a qualitative understanding of the
coupling between the magnetic field and the plasma motion in the stellar wind.
We find that,
*the MHD azimuthal velocity profile actually resembles that for hydrodynamic
Lamb-Oseen vortex; *Keplerian-orbit conditions prevail near a strong rotator
even in a magnetized situation; *Parker's hydrodynamic scenario Par
seems to reappear in the strong magnetization regime.itemize
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