The optical counterparts of the X ray binaries in NGC 6712 and 47 Tucanae

Details The optical counterparts of the X ray binaries in NGC 6712 and 47 Tucanae The optical counterparts of the X ray binaries in NGC 6712 and 47 Tucanae

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992eocm.rept..179k&link_type=abstract

In ESA, Environment Observation and Climate Modelling Through International Space Projects. Space Sciences with Particular Empha

Astronomy and Astrophysics

Astrophysics

Astronomical Photometry, Astronomical Spectroscopy, Luminosity, Star Clusters, X Ray Binaries, Absorption Spectra, Astronomical Observatories, Chile, Line Spectra, Stellar Magnitude

Scientific paper

Photometric and spectroscopic observations in the error box for the x-ray burster X1850-086 in NGC 6712, obtained with the New Technology Telescope at the European Southern Observatory (La Silla), in excellent seeing conditions, are presented. For the first time with an homogeneous set of observations, it is shown that the star, called S, located at about 0.8 arcsec from the x-ray/radio source position, is a UV object with: B = 21.2 + or - 0.2, U-B = -0.8 + or - 0.3 and B-V = 0.2 + or - 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 + or - 0.5 and this object is thus confirmed to belong to the class of compact LMXRB underluminous in the optical. The star S was monitored in the U passband during 4 hours 35 minutes and dimming of the star by about 0.4 mag, at the 3 sigma level, was observed. Two 30 minute long slit spectra with S in the aperture do not show any prominent spectral features characteristic of LMXRB apart a possible filling of the H beta absorption line.

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