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HD 179220


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Near-infrared identification of the counterpart to X1908+075: a new OB-supergiant X-ray binary
We report the near-infrared (near-IR) identification of the likelycounterpart to X1908+075, a highly absorbed Galactic X-ray sourcerecently suspected to belong to the rare class of OB supergiant-neutronstar binary systems. Our JHKs-band imaging of the fieldreveals the existence within the X-ray error boxes of a near-IR sourceconsistent with an early-type star lying at d~ 7 kpc and sufferingAV~ 16 mag of extinction, the latter value being in goodagreement with the hydrogen column density derived from modelling of theX-ray spectrum. Our follow-up, near-IR spectroscopic observationsconfirm the nature of this candidate and lead to a late O-typesupergiant classification, thereby supporting the identification of anew Galactic OB-supergiant X-ray binary.

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Observation and Astrometry data

Constellation:Aigle
Right ascension:19h11m25.72s
Declination:+07°58'41.2"
Apparent magnitude:8.017
Distance:215.054 parsecs
Proper motion RA:-3
Proper motion Dec:-17.4
B-T magnitude:9.191
V-T magnitude:8.114

Catalogs and designations:
Proper Names
HD 1989HD 179220
TYCHO-2 2000TYC 1041-1112-1
USNO-A2.0USNO-A2 0975-14305473
HIPHIP 94285

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