Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..538a&link_type=abstract
Astrophysical Journal, Part 1, vol. 220, Mar. 1, 1978, p. 538-555.
Astronomy and Astrophysics
Astrophysics
27
Cosmic Dust, H Ii Regions, Hydrogen Ions, Infrared Radiation, Milky Way Galaxy, Nebulae, Radiative Transfer, Flux Density, Lyman Alpha Radiation, Orion Constellation, Photons, Stellar Models
Scientific paper
Theoretical models are calculated for the IR emission from silicate core-mantle dust in diffuse H II regions with neutral shells that are optically thin to IR radiation. A simplified treatment of the radiative-transfer problem is assumed, attention is focused on the properties of the IR emission, and the effects of a variable grain composition are examined along with the contribution of a neutral outer shell to the IR luminosity of the H II region. The models provide for refractory core and volatile core-mantle grains with a spatial distribution determined by the sublimation temperatures of the dust materials; the calculations employ optical constants for hydrated and amorphous silicates that seem to fit 10- and 20-micron observations of interstellar dust grains. The contribution of Ly-alpha photons to the IR luminosity is treated in a less approximate manner. The models are applied to the Orion A region. The computed IR spectra for this region are found to indicate that a model with a total UV effective optical depth of unity about equally divided between the ionized region and an outer neutral shell provides reasonable agreement with many but not all observations of Orion A.
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