Partially coherent scattering in stellar chromospheres. II - The first-order escape probability method. III - A second-order probability method

Details Partially coherent scattering in stellar chromospheres. II - The first-order escape probability method. III - A second-order probability method Partially coherent scattering in stellar chromospheres. II - The first-order escape probability method. III - A second-order probability method

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..573g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 573-589.

Computer Science

Performance

10

Chromosphere, Coherent Scattering, Radiative Transfer, Stellar Spectra, Ultraviolet Spectra, Analytic Functions, Approximation, Frequency Distribution, Line Spectra, Scaling Laws

Scientific paper

Approximate analytic expressions are derived for resonance-line wing diagnostics, accounting for frequency redistribution effects, for homogeneous slabs, and slabs with a constant Planck function gradient. Resonance-line emission profiles from a simplified conceptual standpoint are described in order to elucidate the basic physical parameters of the line-forming layers prior to the performance of detailed numerical calculations. An approximate analytic expression is derived for the dependence on stellar surface gravity of the location of the Ca II and Mg II resonance-line profile peaks. An approximate radiative transfer equation using generalized second-order escape probabilities, applicable even in the presence of nearly coherent scattering in the damping wings of resonance lines, is derived. Approximate analytic solutions that can be applied in special regimes and achieve good agreement with accurate numerical results are found.

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