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Since its launch, the INTErnational Gamma-Ray Astrophysics Laboratory(INTEGRAL) satellite has discovered hundreds of X-ray sources, many of whichlack proper classification. This mission also led to the discovery of newcategories of high mass X-ray binaries (HMXB). We use the spectra of theX-Shooter instrument at the Very Large Telescope (VLT) of the European SouthernObservatory (ESO) to better understand the nature of 3 accreting binaries (IGRJ10101-5654, IGR J11435-6109 and IGR J12489-6243) discovered by INTEGRAL. Wemainly focused on the lines and continuum from the X-Shooter spectra. We usedatlases to constrain the nature of the sources and also complemented thespectra with measurements taken by Spitzer and the Wide-field Infrared SurveyExplorer (WISE) in infrared, and parallaxes from Gaia for the distances. Wedetermined the nature of each binary system: a BeHMXB system with a companionstar of spectral type B0.5Ve with peculiar carbon emission for IGR J10101-5654and IGR J11435-6109, and a CV system with an evolved K star (K0IV-K2IV) for IGRJ12489-6243. We also estimated some geometrical parameters of the decretiondisk and neutron star's orbit in the case of IGR J11435-6109.

Classification of 3 accreting binaries with VLT/X-Shooter spectra