New optical positions of the globular cluster X-ray sources NGC 6712:S/X 1850-086 and M 15:AC211/X2127+119

Astronomy and Astrophysics – Astrophysics

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Astrometry, Globular Clusters, Pulsars, Visible Spectrum, X Ray Binaries, Astronomical Photography, Astronomical Photometry, Charge Coupled Devices, Photographic Plates, Photometers, Reference Stars

Scientific paper

Positions of the candidates for the optical counterpart of the X-ray source in the globular cluster NGC 6712 have been determined using photographic plates, image tube films, and CCD and Photon-Counting-Camera frames. The positions were determined with respect to meridian circle observations and the PPM catalog. The small differences of the order of 0.1 sec between our positions of the star called S by Nieto et al. (1990) and the ratio position of Machin et al. (1990) confirm earlier suggestions that this star is indeed the optical counterpart of the X-ray source in NGC 6712. In addition, a new optical position of the X-ray source M 15:AC211/X2127+119 is given.

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