Identification of new low‐mass members of the Alpha Persei open cluster by ROSAT. II
Identification of new low‐mass members of the Alpha Persei open cluster by ROSAT. II
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ROSAT II 识别英仙座α疏散星团的新低质量成员。
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
T. Simon
中科院分区：
文献类型：
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作者：
C. Prosser;S. Randich;T. Simon
通过对三个22-25 ksec ROSAT PSPC点的分析，本研究考察了英仙座α疏散星团（d = 170 pc，年龄= 5000万年）区域中130个X射线源的可能光学对应物。与从α Per（Prosser & Randich 1998）的光栅巡天中获得的73个X射线源一样，采用CCD测光来获得靠近X射线位置的恒星/天体的星等和颜色，并为某些恒星提供了额外的阶梯光栅和低色散Hα光谱。对于近60个X射线源，确定了一个光学对应物与光度学可接受的集群成员资格，其中一些可以被排除在成员资格的基础上不一致的径向速度或X射线特性。根据现有数据，已经确定了大约30个与X射线源相关的新成员或可能成员。对一个在X射线中发现的快速旋光体，得到了一个光度旋转周期。
The present investigation examines possible optical counterparts to 130 X-ray sources in the region of the α Persei open cluster (d ∽ 170pc, age ∽ 50 Myr) resulting from the analysis of three 22–25 ksec ROSAT PSPC pointings. In the same manner as for 73 X-ray sources from a raster survey in α Per (Prosser & Randich 1998), CCD photometry is employed to obtain magnitudes and colors for stars/objects close to the X-ray positions, with additional echelle and low-dispersion Hα spectra provided for some stars. For almost 60 X-ray sources, an optical counterpart with photometry acceptable for cluster membership is identified, some of which can be excluded from membership on the basis of discrepant radial velocity or X-ray characteristics. On the order of 30 new members or likely members associated with X-ray sources have been identified based on available data. A photometric rotation period has been obtained for one rapid rotator identified in X-rays.