Collisional-radiative switching - A powerful technique for converging non-LTE calculations

Details Collisional-radiative switching - A powerful technique for converging non-LTE calculations Collisional-radiative switching - A powerful technique for converging non-LTE calculations

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192..279h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 279, 280.

Statistics

Computation

16

Atmospheric Models, Computational Astrophysics, Nonequilibrium Thermodynamics, Radiative Transfer, Stellar Atmospheres, Line Spectra, Spectrum Analysis

Scientific paper

A very simple technique has been developed to converge statistical equilibrium and model atmospheric calculations in extreme non-LTE conditions when the usual iterative methods fail to converge from an LTE starting model. The proposed technique is based on a smooth transition from a collision-dominated LTE situation to the desired non-LTE conditions in which radiation dominates, at least in the most important transitions. The proposed approach was used to successfully compute stellar models with He abundances of 0.20, 0.30, and 0.50; Teff = 30,000 K, and log g = 2.9.

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