Line profile variability of OB stars: Pulsation, rotation, clumps and magnetic fields

被引：5

作者：

Kholtygin, A. F. ^{[1
]}

Fabrika, S. N. ^{[2
]}

Chountonov, G. A. ^{[2
]}

Burtakova, T. E. ^{[2
]}

Valyavin, G. G.

Kang, Dong-Il

机构：

[1] St Petersburg State Univ, Inst Astrophys, St Petersburg, Russia

[2] Special Astrophys Observ, Nizhnii Arkhyz, Russia

来源：

ASTRONOMISCHE NACHRICHTEN | 2007年 / 328卷 / 10期

关键词：

stars : atmospheres; stars : winds; outflows; stars : magnetic fields;

D O I：

10.1002/asna.200710878

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The variability of line profiles in spectra of bright OB stars has been studied. We obtain more than 1000 high quality spectra of delta Ori A, lambda Ori A, alpha Cam, 19 Cep, iota Her, rho Leo and other target stars. We revealed the line profile microvariability of small amplitude (0.5-3% in the adjacent continuum units) for all observed stars. For most stars only cyclic components of the line profile variability (LPV) at the time scales from hours to days were detected. These components seem to be connected with both the non-radial pulsations (NRP) and rotation line profile modulation. In the spectra of 8 Ori A and A Ori A we found the evidences of the stochastic LPV in spectra, probably connected with the small clumps in the stellar wind. On the basis of recent observations we discuss the origin of the magnetic field of early-type stars. (C) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：1170 / 1172

页数：3

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