A SEARCH FOR PRE-MAIN-SEQUENCE STARS IN HIGH-LATITUDE MOLECULAR CLOUDS .3. A SURVEY OF THE EINSTEIN DATABASE

被引:22
作者
CAILLAULT, JP [1 ]
MAGNANI, L [1 ]
FRYER, C [1 ]
机构
[1] UNIV ARIZONA,DEPT ASTRON,TUCSON,AZ 85726
关键词
ISM; CLOUDS; STARS; PRE-MAIN-SEQUENCE; X-RAYS;
D O I
10.1086/175353
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In order to discern whether the high-latitude molecular clouds are regions of ongoing star formation, we have used X-ray emission as a tracer of youthful stars. The entire Einstein database yields 18 images which overlap 10 of the clouds mapped partially or completely in the CO (1-0) transition, providing a total of approximately 6 deg2 of overlap. Five previously unidentified X-ray sources were detected: one has an optical counterpart which is a pre-main-sequence (PMS) star, and two have normal main-sequence stellar counterparts, while the other two are probably extragalactic sources. The PMS star is located in a high Galactic latitude Lynds dark cloud, so this result is not too surprising. The translucent clouds, though, have yet to reveal any evidence of star formation.
引用
收藏
页码:261 / 269
页数:9
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