Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..35..299d&link_type=abstract
Astrophysics and Space Science, vol. 35, July 1975, p. 299-312.
Astronomy and Astrophysics
Astrophysics
55
H Ii Regions, Particle Interactions, Shock Wave Propagation, Stellar Winds, Astronomical Models, Gas Flow, Globules, Stellar Mass Ejection, Supersonic Flow
Scientific paper
The interaction of a plane-parallel hypersonic stellar wind with a globule in an H II region is considered in two approximations. In both approximations, the ionization front on the globule remains strong-D type, and a flow pattern containing two oppositely facing shock waves results. In the first approximation, the structure of the shocked region is calculated assuming that globule gas and stellar-wind gas mix well and move at the same velocity. However, this assumption results in a very thick shocked layer, and the assumption of good mixing is consequently not well justified. This approximation provides an upper limit on the gas velocities expected in the shocked gas which originated at the globule. In the second approximation, the stellar wind merely applies pressure to balance the momentum flux in the globule gas. The structure of the shocked region is calculated on the assumption that a tangential discontinuity exists between shocked stellar wind and shocked globule gas. Structures may be produced having velocities of the order of 10 km/s and emission measures of the order of 1000 units with reasonable stellar luminosities and mass loss rates.
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