Dust shell models for compact infrared sources

Details Dust shell models for compact infrared sources Dust shell models for compact infrared sources

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..472f&link_type=abstract

Astrophysical Journal, Part 1, vol. 212, Mar. 1, 1977, p. 472-487.

Astronomy and Astrophysics

Astronomy

20

Astronomical Models, Cosmic Dust, Infrared Stars, Radiative Transfer, Stellar Evolution, Density Distribution, Gravitational Collapse, Infrared Astronomy, Infrared Spectra, Integral Equations, Protostars, Radiation Sources, Temperature Distribution

Scientific paper

Recent models for the gravitational collapse of protostellar clouds predict that massive young stars evolving toward the main sequence should be surrounded by dense clouds of gas and dust. The possibility is investigated that the 9.7-micron absorption feature observed in the spectra of some compact infrared sources may have its origin in these dust shells. The general features of infrared spectra between 2 and 33 microns are calculated in terms of radiative transfer within optically thick circumstellar dust shells. An integral-equation representation is adopted for the transfer process through a spherically symmetric inhomogeneous dust shell. For purely absorbing grains in radiative equilibrium, the temperature distribution of the dust grains is calculated throughout the shell for a specified radiation field from the central object. Models are fitted to the infrared spectra of the Becklin-Neugebauer point source, W3/IRS 5, OH 26.5 + 0.6, and AFCRL 809-2992. For each object the infrared energy distribution can be matched satisfactorily by power-law-model density distributions with low-temperature (about 300 to 600 K) central sources. For BN, the available infrared observations are not adequate to specify uniquely the density distribution.

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