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Astron. Astrophys. 328, 283-289 (1997)

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Short term radio variability and polarization properties
of LSI+61°303

M. Peracaula 1, J. Mart 2, 1 and J.M. Paredes 1

1 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
2 CEA/DSM/DAPNIA/Service d'Astrophysique, Centre d'Études de Saclay, F-91191 Gif-Sur-Yvette, France

Received 9 May 1996 / Accepted 7 March 1997


We report the results of more than 30 h of VLA monitoring at 6 cm of the radio emitting X-ray binary LSI+61°303. Small amplitude ([FORMULA] mJy) radio flares have been detected superposed onto the early decay of the expected periodic radio outburst of this source. Such kind of microflares seem to exhibit a recurrence period of 1.4 h. Among different possibilities, we interpret them tentatively as caused by secondary luminosity driven shocks. In addition, we report and discuss the detection of linear polarization in LSI+61°303 at the [FORMULA] level during one of the observing sessions.

Key words: stars: LSI+61O 303 – radio continuum: stars – stars: variables – X-rays: stars – polarization

Send offprint requests to: M. Peracaula

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Note added in proof: After the submission of this paper, new observational facts have arisen concerning LSI+61 [FORMULA] 303. The possible X-ray period of 26.5 days, suggested in the introduction, has been detected by the authors using public data from the All Sky Monitor on board of the RXTE satellite.

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© European Southern Observatory (ESO) 1997

Online publication: March 24, 1998