A physically realistic approximate form for the redistribution function R(II-A)

Details A physically realistic approximate form for the redistribution function R(II-A) A physically realistic approximate form for the redistribution function R(II-A)

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..153a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 153-157.

Astronomy and Astrophysics

Astrophysics

13

Cosmic Plasma, Doppler Effect, Line Spectra, Radiative Transfer, Stellar Atmospheres, Voigt Effect, Distribution Functions, Finite Difference Theory, Integral Equations

Scientific paper

An approximation is proposed to the redistribution function R(II-A) (coherent, isotropic scattering in the rest frame of the atom) which is fast to compute and attains much higher accuracy than previous approximations for the astrophysically important case of small Voigt parameters. Further, the new approximation permits the diffusion in frequency of wing photons ('Doppler drifting') which is lost in one of the widely-used versions of the R(II-A) approximation schemes: Kneer's normalization of the Jefferies-White formulation.

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