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http://hdl.handle.net/20.500.12386/25954
Titolo: | On the Near-infrared Identification of the INTEGRAL Source IGR J16328-4726 | Autori: | Persi, P. FIOCCHI, MARIATERESA Tapia, M. Roth, M. BAZZANO, ANGELA Ubertini, P. Parisi, P. |
Data pubblicazione: | 2015 | Rivista: | THE ASTRONOMICAL JOURNAL | Numero: | 150 | Fascicolo: | 1 | Da pagina:: | 21 | Abstract: | 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. | Acknowledgments: | This 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. | URI: | http://hdl.handle.net/20.500.12386/25954 | URL: | https://iopscience.iop.org/article/10.1088/0004-6256/150/1/21 | ISSN: | 0004-6256 | DOI: | 10.1088/0004-6256/150/1/21 | Bibcode ADS: | 2015AJ....150...21P | Fulltext: | open |
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