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Infrared Spectroscopy of Symbiotic Stars. IV. V2116 Ophiuchi/gx 1+4, The Neutron Star Symbiotic

Hinkle, Kenneth H; Fekel, Francis C; Joyce, Richard R; Wood, Peter R; Smith, Verne V; Lebzelter, Thomas


We have computed, using 17 infrared radial velocities, the first set of orbital elements for the M giant in the symbiotic binary V2116 Ophiuchi. The giant's companion is a neutron star, the bright X-ray source GX 1+4. We rule out the previously proposed period of 304 days and instead find an orbital period of 1161 days, by far the longest of any known X-ray binary. The orbit has a modest eccentricity of 0.10, with an orbital circularization time of ≲5 × 106 yr. The large mass function of the...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1086/500350


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