Non-LTE model atmosphere calculations with approximate lambda operators - Application of tridiagonal operators

Details Non-LTE model atmosphere calculations with approximate lambda operators - Application of tridiagonal operators Non-LTE model atmosphere calculations with approximate lambda operators - Application of tridiagonal operators

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...226..265w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 226, no. 1, Dec. 1989, p. 265-269.

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32

Hot Stars, Nonequilibrium Thermodynamics, Radiative Transfer, Stellar Atmospheres, Stellar Models, Computational Astrophysics, Early Stars, Operators (Mathematics), Perturbation Theory

Scientific paper

Tridiagonal approximate lambda operators proposed by Olson and Kunasz (1987) were introduced into a non-LTE model atmosphere code. The result was a considerable speedup of convergence and a reduction of computing time per iteration step. The convergence properties of the method are demonstrated for a realistic model with 100 non-LTE levels and 233 line transitions, showing that the introduction of the tridiagonal operator resulted in halving of the computing time.

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