Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147...71w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 1, June 1985, p. 71-83. Sponsorship: Deutsche Forschungsgemeinschaft.
Astronomy and Astrophysics
Astronomy
5
Hydrogen Clouds, Interstellar Gas, Interstellar Matter, Nebulae, Resonance Lines, Cosmic Dust, Infrared Astronomy, Optical Thickness, Radiative Transfer
Scientific paper
Under the assumption that dust is either homogeneously mixed throughout or confined to either 1/2 or 1/4 of the space in question, the effect of absorption and scattering by dust grains on resonance lines that were formed in static gaseous nebulae with plane-parallel stratification is studied and a comparison is made between the total emergent flux in the line from the dust-filled nebula and the emergent flux from a dust-free medium. Many line optical thickness values, and several combinations of the opacity ratio of dust and gas, dust albedo, and collision parameter, are compared. A novel method is used to analytically solve the transfer equation for a spectral line in the presence of scattering and absorbing dust. It is noted that dust distribution can have large effects on the value of the total emergent flux.
Kalkofen Wolfgang
Wehrse Rainer
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