Spectroscopic studies of DB white dwarfs: Improved stark profiles for optical transitions of neutral helium

被引:85
作者
Beauchamp, A
Wesemael, F
Bergeron, P
机构
[1] Département de Physique, Université de Montréal, Montréal, Que. H3C 3J7, C.P. 6128, Succ. Centre Ville
关键词
line; formation; profiles; stars; atmospheres; white dwarfs;
D O I
10.1086/312961
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
New Stark profiles for 21 He I lines and their forbidden components have been calculated for electron densities ranging from 10(14) to 6 x 10(17) cm(-3), and for temperatures ranging from 10,000 K to 40,000 K. The profiles include quasi-static broadening by ions as well as electron broadening-the latter treated within the impact approximation near the core, and within the one-perturber approximation in the far wings. The calculated profiles also allow for line dissolution. These new profiles are the cornerstone of a recent reanalysis of the optical spectrum of a large sample of DB white dwarfs. Our calculations provide a very good match to the observed profiles of all the lines, provided that Stark broadening dominates other broadening mechanisms.
引用
收藏
页码:559 / 573
页数:15
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