Einstein Observatory survey of X-ray emission from solar-type stars - The late F and G dwarf stars
Einstein Observatory survey of X-ray emission from solar-type stars - The late F and G dwarf stars
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爱因斯坦天文台对太阳型恒星 X 射线发射的调查 - 晚期 F 和 G 矮星
DOI：
10.1086/165170
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
J. Bookbinder
中科院分区：
文献类型：
--
作者：
A. Maggio;S. Sciortino;G. Vaiana;P. Majer;J. Bookbinder
本文给出了爱因斯坦天文台对F7-G9光谱范围内光度等级为IV和V的恒星进行的有限体积X射线测量的结果。利用生存分析技术，得到了单源和多源在0.15-4.0keV能带内的恒星X射线光度函数。结果表明，这两类源之间的X射线光度差异与多组分系统中单个组分的叠加是一致的，其X射线性质与单组分源的X射线性质相似。我们样本中恒星的X射线发射与它们的色球CA II H-K线发射和它们的赤道自转速度有很好的相关性。将为本地区DG星样本构造的X射线光度函数与其他地方为毕宿星团、昂宿星团和猎户座IC疏散星团得出的相应函数进行比较，证实了X射线辐射水平随着恒星年龄的增加而降低。参考文献62篇。
Results of a volume-limited X-ray survey of stars of luminosity classes IV and V in the spectral range F7-G9 observed with the Einstein Observatory are presented. Using survival analysis techniques, the stellar X-ray luminosity function in the 0.15-4.0 keV energy band for both single and multiple sources. It is shown that the difference in X-ray luminosity between these two classes of sources is consistent with the superposition of individual components in multiple-component systems, whose X-ray properties are similar to those of the single-component sources. The X-ray emission of the stars in our sample is well correlated with their chromospheric CA II H-K line emission and with their projected equatorial rotational velocity. Comparison of the X-ray luminosity function constructed for the sample of the dG stars of the local population with the corresponding functions derived elsewhere for the Hyades, the Pleiades, and the Orion Ic open cluster confirms that the level of X-ray emission decreases with stellar age. 62 references.