Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255p...6c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 1, 1992, p. 6P-10P.
Astronomy and Astrophysics
Astronomy
20
Galactic Nuclei, Infrared Stars, Stellar Mass, Variable Stars, X Ray Binaries, Charge Coupled Devices, Eclipsing Binary Stars, Galactic Bulge, Stellar Luminosity
Scientific paper
Using the IRCAM on UKIRT, it has been discovered that the bright (K = 11 mag) infrared source (NCL 101) at the precise radio position of the Galactic Bulge X-ray source, GX13 + 1, is variable, making it the first of the bright central sources to be so identified. The variability (about 1 mag) is on a time-scale of days or longer, the source remaining constant to within 0.05 mag (in K) during a single 5-hr monitoring run. If this variation is an orbital modulation, then the long period implies that the distinction between Z and Atoll sources is more complex than simply the orbital period. A deep INT Prime Focus image of the field reveals no visible counterpart to this object, with a limit of R greater than 22, indicating heavy obscuration that is consistent with the observed X-ray absorption.
Charles Phil A.
Naylor Tim
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