Oscillator strength calculations in Ce III: Application to HD 200311

被引：25

作者：

Bord, DJ

Cowley, CR

Norquist, PL

机构：

[1] UNIV MICHIGAN,DEPT NAT SCI,DEARBORN,MI 48128

[2] UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109

[3] ALMA COLL,DEPT PHYS,ALMA,MI 48801

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1997年 / 284卷 / 04期

关键词：

atomic data; line; formation; stars; abundances; individual; HD; 200311;

D O I：

10.1093/mnras/284.4.869

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have calculated oscillator strengths for the Ce III spectrum using the atomic structure code of R. D. Cowan. The results are used to determine the cerium abundance in the silicon star HD 200311. From the dominant ion (Ce++), we find an excess of 5 dex. We find very good agreement with the abundance obtained from Ce II lines. While uncertainties remain with the oscillator strengths, it is no longer possible to assume that underionization could explain the extraordinary abundance excess of the lanthanide cerium in this hot, magnetic, chemically peculiar star.

引用

页码：869 / 873

页数：5

共 26 条

[1] PECULIAR A STAR HD 200311 - PHOTOGRAPHIC-REGION LINE-IDENTIFICATION STUDY [J].