Non-LTE gallium abundance in HgMn stars

被引:2
|
作者
Zboril, M [1 ]
Berrington, KA
机构
[1] Astron Inst, SK-05960 Tatranska Lomnica, Slovakia
[2] Sheffield Hallam Univ, Sch Sci & Math, Sheffield S1 1WB, S Yorkshire, England
关键词
stars : abundances; stars : atmospheres; stars : chemically peculiar;
D O I
10.1051/0004-6361:20010567
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present, for the first time, the Non-LTE gallium equivalent widths for the most prominent gallium transitions as identified in real spectra and in (hot) mercury-manganese star. The common feature of the departure coefficients is to decrease near the stellar surface, the collision rates are dominant in many cases and the Non-LTE equivalent widths are generally smaller. In particular, the abundance difference as derived from UV and visual lines is reduced. The photoionization cross sections were computed by means of standard R-matrix formalism.
引用
收藏
页码:987 / 992
页数:6
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