Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990velen.......62k&link_type=abstract
Leningradskii Universitet, Vestnik, Matematika, Mekhanika, Astronomiia (ISSN 0024-0850), Oct. 1990, p. 62-67. In Russian.
Astronomy and Astrophysics
Astronomy
Cosmic Dust, Flux Density, Nebulae, Optical Properties, Point Sources, Anisotropic Media, Diffusion Coefficient, Power Series, Radiation Absorption
Scientific paper
A theoretical investigation of the radiation field in a homogeneous infinite medium at large optical distances from a point source is presented with reference to processes occurring in dust nebulae where the point source is the illuminating star. An asymptotic expression for the radiation intensity is found in terms of the inverse powers of the optical distance tau from the source. In the case of a small true absorption, the radiation intensity is expressed as a double power series of 1/tau and the diffusion coefficient.
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