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Astron. Astrophys. 338, L71-L74 (1998)

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Letter to the Editor

The system LS 5039: a new massive radio emitting X-ray binary

J. Martí 1, 2, J.M. Paredes 3 and M. Ribó 3

1 Departamento de Física Aplicada, Escuela Politécnica Superior, Universidad de Jaén, Calle Virgen de la Cabeza, 2, E-23071 Jaén, Spain
2 DAPNIA/Service d'Astrophysique, CEA/Saclay, F-91191 Gif-Sur-Yvette, France
3 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain

Received 28 July 1998 / Accepted 25 August 1998


We report the discovery of a bright and unresolved radio counterpart to the massive X-ray binary LS 5039. The optical position of this early type star is in excellent agreement with that measured in the radio. The observed spectrum is clearly of non-thermal synchrotron nature and some evidences of variability, although with moderate amplitude, have been detected at both radio and optical wavelengths. All the available data strongly support that LS 5039 is a new member in the reduced family of radio loud massive X-ray binaries.

Key words: stars: individual: LS 5039 – stars: variables: other – radio continuum: stars – X-rays: stars

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

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© European Southern Observatory (ESO) 1998

Online publication: September 17, 1998