X-ray studies of coeval star samples. III. X-ray emission in the Ursa Major stream
X-ray studies of coeval star samples. III. X-ray emission in the Ursa Major stream
复制标题
同时期恒星样本的 X 射线研究。
DOI：
10.1086/168486
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
F. R. Harnden
中科院分区：
文献类型：
--
作者：
J. Schmitt;G. Micela;S. Sciortino;G. Vaiana;F. R. Harnden
结果报告从一个全面的调查的X射线发射的恒星已知或怀疑是成员的UMa集群和/或流。在观测的42颗UMa成员星中，有18颗被探测为X射线源，并对其中10颗具有足够X射线计数的恒星进行了光谱分析。考虑到X射线光度，颜色和运动学的样本恒星之间的关系，和UMa星的X射线光谱的背景下，恒星的X射线温度的一般问题进行了讨论。同时也证实了UMa成员中缺乏X射线发射的A型矮星;在较晚光谱类型的恒星中，X射线光度有相当大的分散。这种分散不能很容易地解释与外地星星闯入者的污染，而似乎是一个属性的UMa X射线光度分布函数。参考文献43篇。
Results are reported from a comprehensive survey of X-ray emission from stars known or suspected to be members of the UMa cluster and/or stream. Of the 42 UMa member stars surveyed, 18 were detected as X-ray sources, and spectral analysis was performed for 10 stars with sufficient X-ray counts. Consideration is given to relations between X-ray luminosity, color, and kinematics of the sample stars, and the X-ray spectra of the UMa stars are discussed in the context of the general problem of stellar X-ray temperatures. Also confirmed is the lack of X-ray-emitting A dwarfs among UMa members; among stars of later spectra type there is a rather large dispersion in X-ray luminosity. This dispersion cannot readily be explained by contamination with field star interlopers and appears rather to be a property of the UMa X-ray luminosity distribution function. 43 refs.