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We report on the archival near-infrared and mid-infrared observations of 7persistent X-ray sources situated in the Galactic bulge using data from theUKIRT Infrared Deep Sky Survey (UKIDSS), Spitzer Galactic Legacy InfraredMid-Plane Survey Extraordinaire (GLIMPSE) and the Wide-field Infrared SurveyExplorer (WISE) all-sky survey. We were able to successfully identify, orprovide upper flux limits for the systems SAX J1747.0-2853, IGR J17464-2811, AXJ1754.2-2754, IGR J17597-2201, IGR J18134-1636, IGR J18256-1035, Ser X-1 andconstrain the nature of these systems. In the case of IGR J17597-2201 wepresent arguments that the source accretes matter from the stellar wind ratherthan via Roche lobe overflow of the secondary. We suggest that, at its X-rayluminosity of $10^{34-35}$ erg s$^{-1}$, we are probing the poorly known classof wind-fed low-mass X-ray binaries (LMXBs).

Sample of optically unidentified X-ray binaries in the Galactic bulge. Constraints on the physical nature from infrared photometric surveys