The optical counterpart of the X-ray binary in the globular cluster NGC 6712

Details The optical counterpart of the X-ray binary in the globular cluster NGC 6712 The optical counterpart of the X-ray binary in the globular cluster NGC 6712

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239..155n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 155-162.

Astronomy and Astrophysics

Astronomy

22

Globular Clusters, Variable Stars, X Ray Binaries, Astronomical Photometry, Color-Magnitude Diagram, Radio Sources (Astronomy), Stellar Spectra

Scientific paper

Results are presented on R and B high-resolution imaging of the field of the X-ray source in the globular cluster NGC 6712, carried out with the Sub-Pupil Imager and the Photon-Counting Detector CP40. The images reveal the presence of two new stars of 21st magnitude in the B band, namely S and Z, which are 0.3 arcsec apart and are located within less than 0.25 arcsec of the U bright object in the field. The B images also show that the Z star is highly variable, by more than 1 mag. It is suggested that star Z is a strong candidate for being the optical counterpart of the X-ray/radio source and, thus, should be also the U object.

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