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A new type of high-energy binary systems has been revealed by the INTEGRALsatellite. These sources are in the course of being unveiled by means ofmulti-wavelength optical, near- and mid-infrared observations. Among thesesources, two distinct classes are appearing: the first one is constituted ofintrinsically obscured high-energy sources, of which IGR J16318-4848 seems tobe the most extreme example. The second one is populated by the so-calledsupergiant fast X-ray transients, with IGR J17544-2619 being the archetype. Wereport here on multi-wavelength optical to mid-infrared observations of asample of 21 INTEGRAL sources. We show that in the case of the obscured sourcesour observations suggest the presence of absorbing material (dust and/or coldgas) enshrouding the whole binary system. We finally discuss the nature ofthese two different types of sources, in the context of high energy binarysystems.

Obscured sources and Supergiant Fast X-ray Transients: new classes of high mass X-ray binaries