Abstract
We report on archival near-infrared and mid-infrared observations of seven persistent X-ray sources situated in the Galactic bulge, using data from the UK Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS), the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) and the Wide-field Infrared Survey Explorer (WISE) all-sky survey. We were able to successfully identify or provide upper flux limits for the systems SAX J1747.0−2853, IGR J17464−2811, AX J1754.2−2754, IGR J17597−2201, IGR J18134−1636, IGR J18256−1035 and Ser X−1 and constrain the nature of these systems. In the case of IGR J17597−2201, we present arguments that the source accretes matter from the stellar wind rather than via Roche-lobe overflow of the secondary. We suggest that, at its X-ray luminosity of 1034 − 35 erg s−1, we are probing the poorly known class of wind-fed low-mass X-ray binaries (LMXBs).
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