Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..808i&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 808-822. Research supported by the University of Minnesota
Astronomy and Astrophysics
Astronomy
84
Infrared Radiation, Interstellar Matter, Nebulae, Radio Sources (Astronomy), Cosmic Dust, Delta Function, H Ii Regions, Hydrogen Ions, Interstellar Radiation, Lyman Alpha Radiation
Scientific paper
Detailed calculations for the observational appearance of nonspherical Stromgren regions at radio and infrared wavelengths are presented. The computations are made feasible by two assumptions, namely (1) no stellar photon leaves the solid angle within which it was emitted, and (2) the radiation spectrum can be represented by three delta functions corresponding to Lyman continuum, Lyman alpha, and softer radiation. These calculations are used to develop models for the H II blisters M17 A and 30 Doradus, and also first order parameters for a sample of other well-studied galactic H II regions. It is concluded that the observations are well explained by an ionizing object in a density gradient, without the need for peculiar dust properties or distribution.
Gatley Ian
Icke Vincent
Israel Frank P.
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