X-ray emission from A-type stars

被引：0

作者：

Schröder, C ^{[1
]}

Schmitt, JHMM ^{[1
]}

Hempel, M ^{[1
]}

Ness, JU ^{[1
]}

机构：

[1] Univ Hamburg, Hamburg, Germany

来源：

PROCEEDINGS OF THE 13TH CAMBRIDGE WORKSHOP ON COOL STARS, STELLAR SYSTEMS AND THE SUN - PROCEEDINGS, VOLS 1 AND 2 | 2005年 / 560卷

关键词：

stars : early-type; stars : activity; X-rays : stars;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Being fully radiative, stars of spectral type A are not expected to harbour magnetic dynamos and hence such stars are not expected to produce X-ray emission. Indeed, while the X-ray detection rate of such stars in X-ray surveys is low, it is not zero and some of the brighter A-type stars have been detected on different occasions and with different instruments. In order to systematically study the puzzle of the X-ray emitting A-type stars, we carried out an X-ray study of all A-type stars listed in the Bright Star Catalogue using the ROSAT public data archive. We found a total of 300 bright A-type stars positionally associated with ROSAT X-ray sources; we analysed the X-ray light curves as well as searched for evidence of RV variations to identify possible late-type companions producing the X-ray emission. We present a list of "bona fide" A-type stars, which axe secure X-ray sources without any evidence (so far) of unresolved companions.

引用

页码：955 / 957

页数：3

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