An expansion opacity formalism for the Sobolev method.

Details An expansion opacity formalism for the Sobolev method. An expansion opacity formalism for the Sobolev method.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...299..770j&link_type=abstract

Astronomy and Astrophysics, v.299, p.770

Astronomy and Astrophysics

Astrophysics

5

Radiative Transfer, Relativity, Supernovae, Stars: Atmospheres, Methods: Analytical

Scientific paper

We present a simple formalism for treating the opacity due to million of lines in atmospheres with large velocity gradients: i.e., an expansion opacity formalism. This formalism is for use with the Sobolev method of radiative transfer. The formalism assumes that lines act like two-level atom lines with complete redistribution, the continuous absorption opacity is in local thermodynamic equilibrium, electron scattering is coherent, and source functions can always be approximated as isotropic. The essential feature of the formalism is that large numbers of lines are replaced by a much smaller set of artificial expansion lines. The formalism is relativistically correct. Demonstration calculations are presented.

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