Near-infrared identification of the counterpart to X1908+075: a new OB-supergiant X-ray binary

Abstract

We report the near-infrared (IR) identification of the likely counterpart to X1908+075, a highly-absorbed Galactic X-ray source recently suspected to belong to the rare class of OB supergiant-neutron star binary systems. Our JHKs-band imaging of the field reveals the existence within the X-ray error boxes of a near-IR source consistent with an early-type star lying at d=7 kpc and suffering A(V)=16 mag of extinction, the latter value being in good agreement with the hydrogen column density derived from a modelling of the X-ray spectrum. Our follow-up, near-IR spectroscopic observations confirm the nature of this candidate and lead to a late O-type supergiant classification, thereby supporting the identification of a new Galactic OB-supergiant X-ray binary.

arXiv commentAccepted for publication in MNRAS, 7 pages, 3 figures

References in corpus (4)

• Northern JHK Standard Stars for Array Detectors
• Near-Infrared Classification Spectroscopy: H-band Spectra of Fundamental MK Standards
• Modeling the near-infrared lines of O-type stars
• X 1908+075: An X-ray Binary with a 4.4 day Period

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