The development of compact dust-bounded H II regions. I - Their relation to infrared objects and maser sources

Details The development of compact dust-bounded H II regions. I - Their relation to infrared objects and maser sources The development of compact dust-bounded H II regions. I - Their relation to infrared objects and maser sources

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211..392c&link_type=abstract

Astrophysical Journal, vol. 211, Jan. 15, 1977, pt. 1, p. 392-399. Research supported by the Aspen Center for Physics

Astronomy and Astrophysics

Astronomy

47

Cosmic Dust, H Ii Regions, Infrared Radiation, Interstellar Masers, Nebulae, Hydroxyl Emission, Infrared Astronomy, Radiation Pressure, Shock Fronts, Stellar Evolution, Stellar Luminosity, Water Masers

Scientific paper

The consequences of the birth of a massive star within a dense dusty cloud are investigated. Radiation pressure from the star sweeps up the grains from the infalling gas to form a dust shell which bounds the H II region of the star. This cocoon is opaque to the stellar photons and will reradiate the stellar luminosity in the infrared, providing a plausible explanation of the infrared 'point' sources associated with dense interstellar cloud complexes. As radiation pressure drives the shell outward, a dense region of cold neutral gas develops between the dust shell and the shock front preceding it which is bathed with the intense infrared radiation from the dust shell. It is suggested that such regions may provide suitable conditions for OH and H2O maser emission. The models are compared with observations of Sharpless 2-106, W3(A) IRS-1 and IRS-8, as well as the OH sources ON-1 and ON-2.

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