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Collisional-radiative switching - A powerful technique for converging non-LTE calculationsA 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.
Document ID
19880044517
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hummer, D. G.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Voels, S. A.
(Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Date Acquired
August 13, 2013
Publication Date
March 1, 1988
Publication Information
Publication: Astronomy and Astrophysics
Volume: 192
Issue: 1-2
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
88A31744
Funding Number(s)
CONTRACT_GRANT: NAGW-766
CONTRACT_GRANT: NSF AST-85-05919
Distribution Limits
Public
Copyright
Other

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