Non-coherent scattering in subordinate lines. V - Solutions of the transfer problem

Details Non-coherent scattering in subordinate lines. V - Solutions of the transfer problem Non-coherent scattering in subordinate lines. V - Solutions of the transfer problem

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jqsrt..32..159h&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 32, Aug. 1984, p. 159-168.

Astronomy and Astrophysics

Astrophysics

12

Atmospheric Scattering, Incoherent Scattering, Radiative Transfer, Stellar Atmospheres, Approximation, Atmospheric Stratification, Distribution Functions, Optical Thickness

Scientific paper

Redistribution functions are defined for resonance scattering and shown to be of use in astrophysics problems. An isotropic approximation is included in a definition of a two-level atom line source function and the redistribution function is angle-averaged for scattered photons, which are treated as negative absorption. Various redistribution functions, either partial or complete, are then applied to slab, isothermal, finite, and semi-infinite atmospheres for a given absorption profile and the line source function to examine the resulting transfer functions. The ratios of the upper/lower level damping are found to have a significant impact on the type of redistribution expected. An approximate form of the redistribution function is determined as adequate for calculating line profiles, especially in the wings.

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