Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978zhetf..75.1278b&link_type=abstract
(Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki, vol. 75, Oct. 1978, p. 1278-1288.) Soviet Physics - JETP, vol. 48, Oct. 1978
Astronomy and Astrophysics
Astrophysics
15
Diffuse Radiation, Emission Spectra, Frequency Distribution, Ion Scattering, Resonance Scattering, Thermalization (Energy Absorption), X Ray Spectra, Approximation, Astrophysics, Doppler Effect, Homogeneity, Kinetic Equations, Line Spectra, Radiative Transfer, Voigt Effect
Scientific paper
This paper suggests that under conditions where the criteria of validity of the hypothesis of complete frequency redistribution in resonance scattering are violated and a real redistribution function must be used, the results obtained on the basis of the cited hypothesis can still be used when redistribution plays an important role only within the Doppler line core. It is shown that the hypothesis of complete frequency redistribution becomes totally unacceptable if a line profile expands beyond the Doppler core in the time available and that expressions for a thermalization length can be applied in order-of-magnitude estimates and qualitative analyses. The thermalization length is obtained from the law of line-profile expansion along the frequency axis in the case of an infinite homogeneous medium for situations where the assumption of complete frequency redistribution is invalid.
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