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Astron. Astrophys. 328, 283-289

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

M. Peracaula1 and J. Martí2,1, and J.M. Paredes1

1Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
2CEA/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$^{\circ}$303. Small amplitude ($\sim4$ 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$^{\circ}$303 at the $\sim2\%$ level during one of the observing sessions.

Key words: stars: LSI+61$^{\circ}$303 - radio continuum: stars - stars: variables - X-rays: stars - polarization

Send offprint requests to: M. Peracaula

© European Southern Observatory (ESO) 1997

Online publication: October 30, 1997
Last change: March 24, 1998