Quasi-molecular lines in Lyman wings of cool DA white dwarfs -: Application to FUSE observations of G 231-40

被引：6

作者：

Hébrard, G

Allard, NF

Hubeny, I

Lacour, S

Ferlet, R

Vidal-Madjar, A

机构：

[1] CNRS, Inst Astrophys Paris, F-75014 Paris, France

[2] Observ Paris, LERMA, F-92195 Meudon, France

[3] Natl Opt Astron Observ, Tucson, AZ 85726 USA

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2002年 / 394卷 / 02期

关键词：

line : profiles; radiation mechanisms : general; stars : atmospheres; stars : individual : G231-40; white dwarfs; ultraviolet : stars;

D O I：

10.1051/0004-6361:20021141

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present new theoretical calculations of the total line profiles of Lyman alpha and Lyman beta which include perturbations by both neutral hydrogen and protons and all possible quasi-molecular states of H-2 and H-2(+). They are used to improve theoretical modeling of synthetic spectra for cool DA white dwarfs. We compare them with FUSE observation of G231-40. The appearance of the line wings between Lyman alpha and Lyman beta is shown to be sensitive to the relative abundance of hydrogen ions and neutral atoms, and thereby to provide a temperature diagnostic for stellar atmospheres and laboratory plasmas.

引用

页码：647 / 651

页数：5

共 33 条

[11] Ab initio calculation of the electronic transition moments for excited states of the H2 molecule [J].