NTT observations of the globular cluster X-ray binary NGC 6712:S/X 1850-086

Details NTT observations of the globular cluster X-ray binary NGC 6712:S/X 1850-086 NTT observations of the globular cluster X-ray binary NGC 6712:S/X 1850-086

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...263...82a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 263, no. 1-2, p. 82-86.

Astronomy and Astrophysics

Astrophysics

13

Globular Clusters, Stellar Spectrophotometry, Variable Stars, X Ray Binaries, Absorption Spectra, H Beta Line, Stellar Color, Stellar Magnitude, Ultraviolet Spectra

Scientific paper

We present new photometric and spectroscopic observations in the error box for the X-ray burster X1850-086 in NGC 6712. We show that the star called S by Nieto et al. (1990) and located at about 0.8 arcsec from the X-ray/radio source position is a UV object with B = 21.2 +/- 0.2, U-B = -0.8 +/- 0.3, and B-V = 0.2 +/- 0.5. Its dereddened colors and X-ray to optical luminosity ratio fit those of a low mass X-ray binary (LMXRB) and thus NGC 6712:S has to be considered as the optical counterpart of X1850-086. The absolute magnitude of NGC 6712:S is as faint as Mv = 5.6 +/- 0.5 and this object is thus confirmed to belong to the class of compact LMXRB underluminous in the optical.

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