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Astron. Astrophys. 329, 951-956 (1998)

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Deep VLA images of LS I +61°303:
a search for associated extended radio emission

J. Mart 1, M. Peracaula 2, J.M. Paredes 2, M. Massi 3, 4 and R. Estalella 2

1 CEA/DSM/DAPNIA/Service d'Astrophysique, Centre d'Etudes de Saclay, F-91191 Gif-Sur-Yvette, Cedex, France
2 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
3 Joint Institute for VLBI in Europe. Postbus 2, 7990 AA, Dwingeloo, The Netherlands
4 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

Received 22 April 1997 / Accepted 20 August 1997


Deep VLA observations at 6 cm of the field around the radio emitting X-ray binary LS I +61°303 have been carried out in an attempt to search for associated extended radio emission. The angular scales explored go from the arcsecond to the arcminute range. Only clumps of extended radio emission within a few arcminutes of the source are detected. However, in contrast with other X-ray binaries with associated extended radio emission, all these clumps seem to be unrelated to LS I +61°303 itself. The fact that some of them are positionally coincident with optical nebulosities in the field strongly suggests an interpretation based on free-free radio emitting material from the nearby HII region W4. The possibility that an undetected radio jet is present in LS I +61°303 is also discussed.

Key words: stars: individual: LS I +61O 303 – stars: radio radiation of – X-rays: binaries – HII regions

Send offprint requests to: J. Mart

© European Southern Observatory (ESO) 1998

Online publication: December 16, 1997