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Title: ON THE NEAR-INFRARED IDENTIFICATION OF THE INTEGRAL SOURCE IGR J16328–4726

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} 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} photometry, a reddening A{sub V} = 23.6 ± 0.7 and a distance of 7.2 ± 0.3 kpc from the Sun are derived.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. INAF/IAPS-Roma, Via fosso del cavaliere, 100, I-00133 Roma (Italy)
  2. Instituto de Astronomía, Universidad Nacional Autónoma de México, Ensenada, B.C. (Mexico)
  3. Las Campanas Observatory, Carnegie Institution of Washington, La Serena (Chile)
Publication Date:
OSTI Identifier:
22520185
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 150; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; CLASSIFICATION; COSMIC X-RAY SOURCES; DISTANCE; INFRARED SPECTRA; MASS; NEAR INFRARED RADIATION; PHOTOMETRY; RESOLUTION; SATELLITES