Redistribution functions for astrophysical problems

Details Redistribution functions for astrophysical problems Redistribution functions for astrophysical problems

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..117m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 1, Jan. 1985, p. 117-123.

Astronomy and Astrophysics

Astrophysics

6

Astronomical Spectroscopy, Frequency Distribution, Plasma Spectra, Radiative Transfer, Space Plasmas, Atomic Excitations, Distribution Functions, Doppler Effect, Fourier Transformation, Lorentz Transformations

Scientific paper

Since the general problem of frequency redistribution is almost impossible to solve exactly, the author offers an approximation that appears convenient for astrophysical plasmas. This approximation takes advantage of the fact that the actual line broadening is always much larger than the pure thermal Doppler broadening. In such case, it is shown that the thermal velocity distribution of the atoms cannot depend upon their atomic state and is not determined by the line radiative processes. As a result the combination of velocity effects and level population effects becomes simpler, and the approximation leads to useful practical redistribution functions covering all cases of interest.

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