An Einstein Observatory X-ray survey of main-sequence stars with shallow convection zones
An Einstein Observatory X-ray survey of main-sequence stars with shallow convection zones
复制标题
爱因斯坦天文台对浅对流区主序星的 X 射线巡天
DOI：
10.1086/162986
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
G. Vaiana
中科院分区：
文献类型：
--
作者：
J. Schmitt;L. Golub;F. R. Harnden;C. Maxson;R. Rosner;G. Vaiana
给出了对 0.1 和 0.5 之间的主 B-V 序列上明亮的晚期 A 和早期 F 恒星进行 X 射线巡天的结果。爱因斯坦天文台对所有恒星进行了至少 500 秒的观察。调查结果显示，双星样本的 X 射线光度明显大于单星。有人认为这种差异是由于双星中存在多个 X 射线源造成的。结果表明，单星的 X 射线光度随着颜色的增加而迅速增加，并且 Lx/Lbol 等于约 10 的 -7 次方的关系对于 A 星不成立。 X射线光度与预计的赤道自转速度之间没有发现相关性。根据观测结果，有人认为样本恒星中的 X 射线发射源自日冕。讨论了支持这一观点的现有观察证据。
The results of an X-ray survey of bright late A and early F stars on the main B-V sequence between 0.1 and 0.5 are presented. All the stars were observed with the Einstein Observatory for a period of at least 500 seconds. The survey results show significantly larger X-ray luminosities for the sample binaries than for the single stars. It is suggested that the difference is due to the presence of multiple X-ray sources in binaries. It is shown that the X-ray luminosities for single stars increase rapidly with increasing color, and that the relation Lx/Lbol is equal to about 10 to the -7th does not hold for A stars. No correlation was found between X-ray luminosity and projected equatorial rotation velocity. It is argued on the basis of the observations that X-ray emission in the sample stars originated from coronae. The available observational evidence supporting this view is discussed.