Results from an extensive Einstein stellar survey.
Results from an extensive Einstein stellar survey.
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广泛的爱因斯坦恒星调查的结果。
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
C. Zwaan
中科院分区：
文献类型：
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作者：
G. Vaiana;J. Cassinelli;G. Fabbiano;R. Giacconi;L. Golub;P. Gorenstein;B. Haisch;F. R. Harnden;H. M. Johnson;J. Linsky;C. Maxson;R. Mewe;R. Rosner;F. Seward;K. Topka;C. Zwaan
本文报道了爱因斯坦天文台恒星X射线巡天的初步结果。到目前为止，已经确认了143个软X射线源与恒星对应，毫无疑问，恒星通常构成了一个普遍存在的低光度星系X射线源。我们已经探测到了沿着整个主序星，所有光度等级的恒星，前主序星以及非常演化的恒星。早期型OB星的X射线光度范围约为10/sup 31/至10/sup 34/ ergs/sup-1/;晚期型OB星的X射线辐射水平范围略低，约为10/sup 26/至10/sup 31/ ergs/sup-1/。晚型主序星的X射线辐射水平对恒星有效温度的依赖性很小;同样，观测结果表明X射线光度对有效重力的依赖性很弱（如果有的话）。相反，数据显示了一个广泛的范围内的排放水平（约三个数量级）在整个主序列晚于F0。将数据与已发表的声加热冠状理论进行比较表明，这些模型不足以解释我们的结果。这些数据与磁主导的日冕是一致的，就像太阳一样。
We report the preliminary results of the Einstein Observatory stellar X-ray survey. To date, 143 soft X-ray sources have been identified with stellar counterparts, leaving no doubt that stars in general constitute a pervasive class of low-luminosity galactic X-ray sources. We have detected stars along the entire main sequence, of all luminosity classes, pre-main sequence stars as well as very evolved stars. Early type OB stars have X-ray luminosities in the range approx.10/sup 31/ to approx.10/sup 34/ ergs s/sup -1/; late type stars show a somewhat lower range of X-ray emission levels, from approx.10/sup 26/ to approx.10/sup 31/ ergs s/sup -1/. Late type main-sequence stars show little dependence of X-ray emission levels upon stellar effective temperature; similarly, the observations suggest weak, if any, dependence of X-ray luminosity upon effective gravity. Instead, the data show a broad range of emission levels (approx.three orders of magnitude) throughout the main sequence later than F0. Comparison of the data with published theories of acoustically heated coronae shows that these models are inadequate to explain our results. The data are consistent with magnetically dominated coronae, as in the solar case.