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The supergiant High Mass X-ray Binary IGR J16318-4848 was the first sourcedetected by the INTEGRAL satellite in 2003 and distinguishes itself by its highintrinsic absorption and B[e] phenomenon. It is the perfect candidate to studyboth binary interaction and the environment of supergiant B[e] stars. Thisstudy targets the local properties of IGR J16318-4848. We aim to clarify thegeometry of this system, and distinguish different key emitting regions in thebinary. We provide optical to near-infrared spectra from VLT/X-Shooter andanalyse both fine structures of the lines and the broadband spectral energydistribution by adding archival mid-infrared Spitzer and Herschel data. We alsoperformed a stellar atmosphere and wind modeling of the optical tonear-infrared spectrum using the PoWR code. We determine the contribution ofthe irradiated inner edge of the dusty circumbinary disk, derive the velocityof an equatorial stellar wind, and suggest the compact object orbits within thecavity between the star and the disk. We report on flat-topped linesoriginating from a spherically symetric disk wind, along with the firstdetection of what is likely the polar component of the stellar wind. Stellaratmosphere and wind modeling shows that the central star may have ahelium-enhanced atmosphere, likely because of its intense wind sheding part ofits hydrogen envelope. Finally we compare the properties of IGR J16318-4848with a similar source, CI Cameleopardis.

Optical and infrared study of the obscured B[e] supergiant high-mass X-ray binary IGR J16318-4848