Mathematics – Spectral Theory
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..287l&link_type=abstract
Astronomy and Astrophysics, vol. 112, no. 2, Aug. 1982, p. 287-291.
Mathematics
Spectral Theory
5
Line Spectra, Stellar Atmospheres, Stellar Spectra, Atmospheric Turbulence, Magnetohydrodynamic Turbulence, Optical Thickness, Radiative Transfer, Spectral Energy Distribution, Spectral Line Width, Spectral Theory, Thermodynamic Equilibrium, Velocity Distribution
Scientific paper
In a previous work the effective cell approximation was introduced in order to treat the line transfer problem in the presence of velocity fields with a view of taking full account of the spatial correlation of the field. Results relative to the mean emergent intensity were obtained. Here are presented calculations pertaining to the fluctuations of the intensity. The profiles are studied as a function of the velocity of the last emitting layer. It is shown that the individual profiles strongly deviate from the mean value as soon as the optical depth over one correlation length reaches values about unity. The results could invalidate most studies based on the consideration of lines formed in averaged medium.
Loucif Mohammed Lakhdar
Magnan Christian
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