Numerical solution of the expanding stellar atmosphere problem

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In this paper we discuss numerical methods and algorithms for the solution of NLTE stellar atmosphere problems involving expanding atmospheres, e.g., found in novae, supernovae and stellar winds. We show how a scheme of nested iterations can be used to reduce the high dimension of the problem to a number of problems with smaller dimensions. As examples of these sub-problems, we discuss the numerical solution of the radiative transfer equation for relativistically expanding media with spherical symmetry, the solution of the multi-level nonLTE statistical equilibrium problem for extremely large model atoms, and our temperature correction procedure. Although modern iteration schemes are very efficient, parallel algorithms are essential in making large-scale calculations feasible, therefore we discuss some parallelization schemes that we have developed.

论文关键词:Stellar atmospheres,Radiative transfer,Parallel Numerical algorithms,NLTE

论文评审过程:Received 10 February 1998, Revised 16 August 1998, Available online 30 November 1999.

论文官网地址:https://doi.org/10.1016/S0377-0427(99)00153-3