A Search for Pre--Main-Sequence Stars in High-Latitude Molecular Clouds. III. A Survey of the Einstein Database
Abstract
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 ~6 deg^2^ 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1995
- DOI:
- 10.1086/175353
- Bibcode:
- 1995ApJ...441..261C
- Keywords:
-
- Main Sequence Stars;
- Molecular Clouds;
- Pre-Main Sequence Stars;
- Star Formation;
- X Ray Stars;
- Astronomical Maps;
- Carbon Monoxide;
- Data Bases;
- Heao 2;
- Image Analysis;
- Sky Surveys (Astronomy);
- Astronomy;
- ISM: MOLECULES;
- STARS: PRE--MAIN-SEQUENCE;
- X-RAYS: STARS