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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: | Αετός |
| 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 |
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