Recent analytical work on magnetic shaping of wind-driven nebulae suggests that diverging stellar winds with frozen-in toroidal magnetic fields (occurring naturally when the wind originates from a rotating source) may evolve into collimated outflows. We report numerical simulations which show that the MHD collimation of stellar winds is indeed possible provided that the field carried by the wind is sufficiently strong. Our collimation mechanism operates in the shocked wind region of the nebula, leading to the formation of an "astrophysical plasma gun" recently invoked to accelerate jets associated with accretion disks.
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