Optical and infrared study of the obscured B[e] supergiant high-mass
  X-ray binary IGR J16318-4848
  The supergiant High Mass X-ray Binary IGR J16318-4848 was the first source
detected by the INTEGRAL satellite in 2003 and distinguishes itself by its high
intrinsic absorption and B[e] phenomenon. It is the perfect candidate to study
both binary interaction and the environment of supergiant B[e] stars. This
study targets the local properties of IGR J16318-4848. We aim to clarify the
geometry of this system, and distinguish different key emitting regions in the
binary. We provide optical to near-infrared spectra from VLT/X-Shooter and
analyse both fine structures of the lines and the broadband spectral energy
distribution by adding archival mid-infrared Spitzer and Herschel data. We also
performed a stellar atmosphere and wind modeling of the optical to
near-infrared spectrum using the PoWR code. We determine the contribution of
the irradiated inner edge of the dusty circumbinary disk, derive the velocity
of an equatorial stellar wind, and suggest the compact object orbits within the
cavity between the star and the disk. We report on flat-topped lines
originating from a spherically symetric disk wind, along with the first
detection of what is likely the polar component of the stellar wind. Stellar
atmosphere and wind modeling shows that the central star may have a
helium-enhanced atmosphere, likely because of its intense wind sheding part of
its hydrogen envelope. Finally we compare the properties of IGR J16318-4848
with a similar source, CI Cameleopardis.
