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Optical counterparts for X-ray sources in M31
Crampton, D.; Cowley, A. P.; Hutchings, J. B.; Schade, D. J.; van Speybroeck, L. P.
AA(Canada-France-Hawaii Telescope Corp., Kamuela, HI; Dominion Astrophysical Observatory, Victoria, British Columbia, Canada), AB(Canada-France-Hawaii Telescope Corp., Kamuela, HI; Dominion Astrophysical Observatory, Victoria, British Columbia, Canada), AC(Canada-France-Hawaii Telescope Corp., Kamuela, HI; Arizona State University, Tempe, AZ), AD(Dominion Astrophysical Observatory, Victoria, British Columbia, Canada), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 663-669. NSF-supported research. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Andromeda Galaxy, Blue Stars, Globular Clusters, Radio Sources (Astronomy), Supernova Remnants, X Ray Sources, B Stars, Compact Galaxies, Magellanic Clouds, Milky Way Galaxy, O Stars, Optical Emission Spectroscopy
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Einstein Observatory X-ray position (both IPC and HRI) for 117 sources around M31 have been examined with 1000 A/mm slitless spectral plates obtained at the prime focus of the Canada-France-Hawaii Telescope (CFHT). A variety of possible counterparts is found within the error circles of the source positions, including globular clusters, foreground stars, faint blue stars, and a compact galaxy. For about half of the sources, no candidate object sufficiently near the X-ray position was visible on the plates which reach to a B-mag of about -3.5. Crowding in the nucleus of M31 made it impossible to examine the source positions less than 2 to 3 arcmin from the center of the galaxy. This paper lists all sources with their suggested optical identifications and gives finding charts for some of the stars. A brief comparison is made among the X-ray sources in M31, the Magellanic Clouds, and the Galaxy.

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