Statistics – Computation
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..364h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 2, July 1985, p. 364-368.
Statistics
Computation
54
Computational Astrophysics, Line Spectra, Perturbation Theory, Radiative Transfer, Stellar Atmospheres, Stellar Spectra, Atomic Energy Levels, Iterative Solution, Operators (Mathematics), Optical Thickness, Resonance Lines, Wolf-Rayet Stars
Scientific paper
The perturbation technique presently applied to the line formation in expanding atmospheres employs an approximate lambda operator and has the advantage of solving the accurate transfer equation with the given source function. An approximate lambda operator is constructed from the viewpoint of the comoving frame of reference, and an iteration scheme is derived for the simple case of two-level atoms. Test calculations are performed, and satisfactory convergence is obtained even in cases of extreme optical thickness. The multilevel problem may be treated in a similar fashion.
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