Stellar winds in H II regions. II - Turbulent mixing between an H II layer and a stellar wind bubble in the presence of a magnetic field

Astronomy and Astrophysics – Astronomy

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H Ii Regions, Magnetohydrodynamic Turbulence, Stellar Magnetic Fields, Stellar Winds, Turbulent Mixing, Acoustic Instability, Magnetic Field Configurations, Shock Wave Interaction, Solar Activity Effects

Scientific paper

The turbulent mixing between an ionization-bounded H II layer, and a hot shocked stellar wind (HSSW) which keeps it under pressure, is discussed. The turbulence is driven by the acoustic instability described by Breitschwerdt and Kahn (1988). The stretching of fluid elements and of a frozen-in magnetic field, are calculated and a condition is derived under which turbulence can decay to small enough length-scales so that effective mixing takes place. These arguments are used to describe the evolution of a wind-driven bubble around an early-type star. If there is a uniform ambient magnetic field, mixing occurs freely below a critical polar angle.

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