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Astron. Astrophys. 338, L95-L99 (1998)

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Letter to the Editor

Search for the optical and infrared counterpart of GRS 1758-258

J. Martí 1, 2, S. Mereghetti 3, S. Chaty 1, I.F. Mirabel 1, 4, P. Goldoni 1 and L.F. Rodríguez 5

1 DAPNIA/Service d'Astrophysique, CEA/Saclay, F-91191 Gif-Sur-Yvette, France
2 Departamento de Física Aplicada, Escuela Politécnica Superior, Universidad de Jaén, Calle Virgen de la Cabeza, 2, E-23071 Jaén, Spain
3 Istituto di Fisica Cosmica G.Occhialini, via Bassini 15, I-20133 Milano, Italy
4 Instituto de Astronomía y Física del Espacio, C.C. 67, Suc. 28, 1428 Buenos Aires, Argentina
5 Instituto de Astronomía, UNAM, Apdo. Postal 70-264, 04510 México D.F., Mexico

Received 28 July 1998 / Accepted 25 August 1998


We report the results of a deep search for the optical and near infrared counterpart of the microquasar source GRS 1758-258. At least two possible candidate counterparts of the binary star companion have been recognized on the basis of astrometric coincidence to within [FORMULA]. Our photometric study shows that the brightest of them would be consistent with a K-type giant star, while the weakest one would be a main sequence F companion. Follow up spectroscopic observations in the near infrared H and K-bands have failed so far to provide evidence for emission lines that may support an unambiguous identification. However, the proximity of these two sources to the sub-arcsec VLA radio position of GRS 1758-258 makes them deserving further attention in the future.

Key words: stars: individual: GRS 1758-258 – X-rays: stars – radio continuum: stars

Send offprint requests to: J. Martí, jmarti@discovery.saclay.cea.fr

© European Southern Observatory (ESO) 1998

Online publication: September 17, 1998