Infall and outflow activities in the Be star FYCMa

被引：3

作者：

Cao, HL ^{[1
]}

机构：

[1] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

[2] Peking Univ, CAS PKU Joint Beijing Astrophys Ctr, Beijing 100871, Peoples R China

来源：

CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS | 2001年 / 1卷 / 06期

关键词：

line : profiles; stars : activity; stars; emission-line; Be; circumstellar matter; stars : mass-loss; ultraviolet : stars;

D O I：

10.1088/1009-9271/1/6/514

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Unusual activity of outflow mass motion connected with infall events was recorded for the B0.5 IVe star FY CMa in February 1987 from both archival IUE spectrograms of circumstellar N V resonance lines and optical spectra of Ha and He I lambda5876 Angstrom emission lines which showed inverse P Cygni-type profiles. We estimate the mass loss rate using ultraviolet Si IVresonance lines with expanding atmosphere modeling calculations, and describe how the radial pressure performs the dominant role in accelerating the stellar wind. We attempt to give a qualitative explanation for the activity observed for FY CMa in terms of circumstellar matter raining down to the star.

引用

页码：514 / 524

页数：11