A possible optical counterpart for the M 15 globular cluster X-ray source

Details A possible optical counterpart for the M 15 globular cluster X-ray source A possible optical counterpart for the M 15 globular cluster X-ray source

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..415a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 415-420.

Astronomy and Astrophysics

Astrophysics

82

Astronomical Photography, Binary Stars, Globular Clusters, X Ray Sources, Astronomical Maps, Emission Spectra, High Resolution, Optical Properties, Variable Stars, X Ray Binaries

Scientific paper

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.

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