AN INVESTIGATION OF BRUECKNER THEORY OF LINE BROADENING WITH APPLICATION TO THE SODIUM-D LINES

被引:111
作者
ANSTEE, SD
OMARA, BJ
机构
[1] Department of Physics, University of Queensland, St. Lucia, 4072, QLD
关键词
D O I
10.1093/mnras/253.3.549
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Approximations in Brueckner's theory of spectral line broadening by collisions with neutral hydrogen atoms relevant to a solar-type atmosphere are discussed, and a modified theory for s-p transitions is presented. The theory utilizes explicit expressions for the interatomic interaction energy between a hydrogen atom in its ground state and general m = 0, +/- 1 p states, derived from second-order perturbation theory without exchange, allowing the removal of the Lindholm-Foley average over m states in the original Brueckner model. Approximate upper and lower bounds for the linewidth of the sodium D lines are derived, and these values are contrasted with available theoretical, experimental and solar empirical results. The removal of the Lindholm-Foley average is shown to reduce the D-state linewidths by about 30 per cent, and an analysis of the interatomic separations important in the line broadening cross-section for the D lines has shown that there is little atomic overlap at the separations that are important.
引用
收藏
页码:549 / 560
页数:12
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