A possible optical counterpart for the M 15 globular cluster X-ray source.
Abstract
The authors report on a high spatial resolution photographic study of stars resolved in the error box of the M15 X-ray source. Their observations were obtained at the 3.6 m Canada-France-Hawaii telescope and at the 2 m and 1 m Pic-du-Midi Observatory telescopes. They show that star No. 211 of the Aurière-Cordoni (1981) catalogue is probably the optical counterpart of the X-ray source since: (1) it is a "UV star", (2) it is a variable star. Its optical properties are consistent with those of some low (or intermediate) mass X-ray binaries (including Her X-1) scaled to the M15 X-ray flux rather than with those of classical globular cluster variable stars.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1984
- Bibcode:
- 1984A&A...138..415A
- Keywords:
-
- Astronomical Photography;
- Binary Stars;
- Globular Clusters;
- X Ray Sources;
- Astronomical Maps;
- Emission Spectra;
- High Resolution;
- Optical Properties;
- Variable Stars;
- X Ray Binaries;
- Astrophysics