Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..209k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 15, 1990, p. 209-214. Research supported by S
Astronomy and Astrophysics
Astronomy
20
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.
Breitschwerdt Dieter
Kahn F. D.
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