A candidate optical and infrared counterpart for GRS 1739-278.

Details A candidate optical and infrared counterpart for GRS 1739-278. A candidate optical and infrared counterpart for GRS 1739-278.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..158m&link_type=abstract

Astronomy and Astrophysics, v.323, p.158-162

Astronomy and Astrophysics

Astrophysics

6

X-Rays: Stars, Infrared: Stars, Radio Continuum: Stars, Stars: Individual: Grs 1739-278 (Granat 1739-278)

Scientific paper

The accurate radio position of the hard X-ray transient GRS 1739-278 has been observed with different ESO telescopes in a search for optical and near infrared counterpart. A candidate counterpart has been detected in all filters observed within less than 1" of the radio position. No significant optical nor near infrared photometric variability is observed within ~0.2mag in a time scale of several weeks. Our spectral type and reddening analysis appears to be consistent with either a normal massive X-ray binary or a low mass X-ray binary with a giant companion, both at roughly the galactic center distance. The a priori probability of a chance superposition in a field as crowded as that of GRS 1739-278 is estimated to be 14%. However, this decreases to less than 1% if the source belongs to any of the spectral types and luminosity classes proposed.

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