Persi, P.P.PersiFIOCCHI, MARIATERESAMARIATERESAFIOCCHITapia, M.M.TapiaRoth, M.M.RothBAZZANO, ANGELAANGELABAZZANOUbertini, P.P.UbertiniParisi, P.P.Parisi2020-06-082020-06-0820150004-6256http://hdl.handle.net/20.500.12386/25954This work is based on observations made with the Baade telescope located at Las Campanas Observatory (Chile). We thank Dr. Andrew Monson for obtaining the JHK s images at our request. M. Tapia acknowledges DGAPA/UNAM grant No. IN-101813.The aim of this work is to identify the infrared (IR) counterpart of the Galactic high-mass X-ray binary IGR J16328-4726 discovered by the INTEGRAL satellite, and to derive the extinction and distance to the system. We present new deep sub-arcsecond JHK<SUB>s</SUB> imaging and low-resolution near-IR spectroscopy in the 1.5 and 2.4 μm range of IGR J16328-4726. We report the presence of two near-IR stellar sources separated by about 1.″8 at the location of the unresolved 2MASS source J16323791-4723409, previously considered to be the near-IR counterpart of the X-ray source. From the analysis of their near-IR colors and spectra as well as accurate positions, we uniquely identify the true IR counterpart of IGR J16328-4726. Our 1.5-2.4 μm spectrum of this star is consistent with the published classification O8Iafpe. Assuming this, and in combination with new JHK<SUB>s</SUB> photometry, a reddening A<SUB>V</SUB> = 23.6 ± 0.7 and a distance of 7.2 ± 0.3 kpc from the Sun are derived.STAMPAenArticle10.1088/0004-6256/150/1/212-s2.0-84936079010000357744400021https://iopscience.iop.org/article/10.1088/0004-6256/150/1/212015AJ....150...21PFIS/05 - ASTRONOMIA E ASTROFISICA