The Infrared Counterpart of the Microquasar GRS 1758−258 | Zendy

David M. Rothstein | Zendy; S. S. Eikenberry | Zendy; Shami Chatterjee | Zendy; Eiichi Egami | Zendy; S. G. Djorgovski | Zendy; W. A. Heindl | Zendy

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The Infrared Counterpart of the Microquasar GRS 1758−258

Author(s) -

David M. Rothstein,

S. S. Eikenberry,

Shami Chatterjee,

Eiichi Egami,

S. G. Djorgovski,

W. A. Heindl

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/345546

Subject(s) - physics , roche lobe , astrometry , infrared , astrophysics , binary number , orbit (dynamics) , telescope , compact star , x ray binary , astronomy , binary star , stars , neutron star , arithmetic , mathematics , engineering , aerospace engineering

We present revised infrared (2.2 micron) astrometry of the field containingthe Galactic microquasar GRS 1758-258, using observations at the Keck I 10-mtelescope. We find three candidates for the microquasar within a 3 sigma errorcircle, but none within 2 sigma. We show that if the 18.4 day X-ray period ofGRS 1758-258 is due to a binary orbit, then only one of the three candidates,an early K-type giant, is large enough to power the microquasar via Roche lobeoverflow. We therefore identify this star as the infrared counterpart of GRS1758-258, which we classify as a low mass X-ray binary. Long term infraredmonitoring of this source should provide further information about themicroquasar system, including a confirmation of the X-ray period and anestimate of the compact object's mass.Comment: 4 pages, 2 figures; accepted for publication in ApJ Letter

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