X-ray emission from A-type stars
X-ray emission from A-type stars
复制标题
A型恒星的X射线发射
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
J. Schmitt
中科院分区：
文献类型：
--
作者：
C. Schröder;J. Schmitt
由于光谱类型A的恒星是完全辐射的，因此不可能拥有磁发电机，因此这类恒星不可能产生X射线辐射。事实上，虽然在X射线巡天中这类恒星的X射线探测率很低，但它不是零，一些更亮的A型恒星已经在不同的场合和不同的仪器上被探测到。为了系统地研究A型星的X射线辐射问题，我们利用ROSAT公共数据库对亮星星表中的所有A型星进行了X射线研究。我们总共发现了312颗与ROSAT X射线源位置相关的明亮A型恒星;我们分析了X射线光变曲线，并寻找RV变化的证据，以确定可能产生X射线发射的晚期伴星。本文给出了一个X射线活跃的A型星的列表，包括所收集的关于多重数、X射线光度和光谱特征的数据。
Being fully radiative, stars of spectral type A are not expected to harbor 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. To study systematically 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 312 bright A-type stars positionally associated with ROSAT X-ray sources; we analyzed 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. In this paper we present a list of X-ray active A-type stars, including the collected data about multiplicity, X-ray luminosity and spectral peculiarities.