Far UV spectroscopy of the circumstellar environment of the Herbig Be stars HD 259431 and HD 250550

被引：24

作者：

Bouret, JC

Martin, C

Deleuil, M

Simon, T

Catala, C

机构：

[1] Traverse Siphon, Lab Astrophys Marseille, F-13376 Marseille 12, France

[2] Univ Aix Marseille 1, Ctr Math & Informat, F-13453 Marseille, France

[3] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[4] Observ Paris, CNRS, Paris, France

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 410卷 / 01期

关键词：

stars : circumstellar matter; stars : pre-main sequence; stars; emission-lines; Be; individual; HD; 259431; 250550;

D O I：

10.1051/0004-6361:20031151

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an analysis of FUSE spectra of HD 259431 and HD 250550, two young Herbig Be stars. Numerous absorption lines of H-2 are seen in the spectrum of each star, revealing large amounts of this gas on the lines of sight. In addition, absorption lines from atomic species in different ionization and excitation states are also identified. We demonstrate that all these species probe the close circumstellar environment around the stars, with two or even three temperature components in HD 259431, as revealed by molecular gas analysis. Although favouring the flared disk scenario, our results do not rule out the possibility that we actually detect CS envelopes/halos around these stars.

引用

页码：175 / 188

页数：14