WIND VARIABILITY IN O-TYPE STARS

被引：28

作者：

KAPER, L ^{[1
]}

HENRICHS, HF ^{[1
]}

机构：

[1] CHEAF,1098 SJ AMSTERDAM,NETHERLANDS

来源：

ASTROPHYSICS AND SPACE SCIENCE | 1994年 / 221卷 / 1-2期

关键词：

O-STARS; STELLAR WINDS; VARIABILITY; DACS;

D O I：

10.1007/BF01091147

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An observational description is presented of the time-dependent behaviour of Discrete Absorption Components (DACs) in ultraviolet spectra of O-type stars. DACs represent the strongest manifestation of stellar-wind variability, a characteristic property of radiation-driven winds. Wind variability sets in already close to the star, as is evidenced by the low-velocity variations in several subordinate ultraviolet and optical lines. The observed characteristic timescale of the variability strongly suggests that stellar rotation plays a dominant role. We discuss the DAC behaviour in terms of a model in which (localized) surface magnetic field regions impose an additional. boundary condition at the base of the stellar wind, which may give rise to the-observed large-scale structures.

引用

页码：115 / 133

页数：19

共 32 条

[1] SPECTROSCOPIC OBSERVATIONS OF O-TYPE STARS .5. HYDROGEN LINES AND LAMBDA-4686 HE-II [J].