Multi-level non-LTE line formation calculations using approximate Lambda-operators

Details Multi-level non-LTE line formation calculations using approximate Lambda-operators Multi-level non-LTE line formation calculations using approximate Lambda-operators

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..417w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 2, July 1985, p. 417-422.

Mathematics

93

Line Spectra, Nonequilibrium Thermodynamics, Stellar Atmospheres, Stellar Spectra, Hydrogen Atoms, Iteration, Operators (Mathematics), Radiative Transfer

Scientific paper

A new method to carry out non-LTE multi-level line formation calculations in plane-parallel, static stellar atmospheres is developed, using an approximate lambda operator as presented by Scharmer (1981) for the description of the radiative transfer problem, combined with a perturbation technique to iterate to the exact solution of the transfer equation. In this way, model atoms with up to 100 non-LTE levels can be treated with less computational effort than is needed for 20-level atoms when using the usual complete linearization techniques. The applicability of the method with the example of a 5-level hydrogen atom with continuum is demonstrated.

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