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Astron. Astrophys. 330, 612-618 (1998)

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Rapid expansion in the VLBI structure of LSI+61°303

M. Peracaula 1, 2, D.C. Gabuzda 3 and A.R. Taylor 1

1 Department of Physics and Astronomy, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4 Canada
2 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
3 Astro Space Center, Lebedev Physical Institute, 53 Leninsky Pr., 117924 Moscow, Russia

Received 28 January 1997 / Accepted 18 September 1997


We present the results of global VLBI observations at 6 cm wavelength of the X-ray binary LSI+61°303 made at epoch 1992.4. During the course of our 24 hour VLBI observing session, the integrated flux measured simultaneously with the VLA indicated that the source was experiencing a minor flare, with the total flux rising and falling by [FORMULA] mJy. Our VLBI observations indicate that this brightening occurred on milli-arcsecond scales, and was accompanied by an increase of the compact radio structure size with velocity [FORMULA], which appeared to decelerate rapidly upon reaching a dimension of about 4 AU.

Key words: stars: individual: LSI+61O 303 – stars: variables – stars: emission-line, Be – radio continuum: stars – X-rays: stars

Send offprint requests to: M. Peracaula

© European Southern Observatory (ESO) 1998

Online publication: January 16, 1998