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

来源：

ASTRONOMY & ASTROPHYSICS | 2001年 / 373卷 / 03期

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

页码：987 / 992

页数：6

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