Radiative transfer in axisymmetric dust clouds

Details Radiative transfer in axisymmetric dust clouds Radiative transfer in axisymmetric dust clouds

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..275e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 275-288.

Astronomy and Astrophysics

Astronomy

95

Active Galactic Nuclei, Cosmic Dust, Protostars, Radiative Transfer, Reflection Nebulae, Starburst Galaxies, Density Distribution, Late Stars, M Stars, Star Formation, Stellar Envelopes, Supergiant Stars

Scientific paper

This paper presents a method of solution of the equation of radiative transfer for an axisymmetric distribution of dust around a central source. The program integrates the equation of radiative transfer exactly in the sense that it does not neglect any terms in the equation and treats multiple anisotropic scattering. The emergent spectral energy and intensity distributions are obtained for different viewing angles for models with different density distributions and optical depths. The method applies to an arbitrary density distribution, but, in this paper, models of clouds in which the thickness of the disk increases linearly with distance from the central source and the disk is symmetric about the equatorial plane are presented. The density is assumed to decline with radius as 1/r sq and with a power-law dependence on azimuthal angle Theta. Also presented is a model that gives an excellent fit to the spectrum of VY CMa, a late M supergiant which has long been thought to be surrounded by a circumstellar disk. The model predicts an unusual viewing angle, just inside the surface of the flared disk.

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