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Astron. Astrophys. 335, 539-544 (1998)

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Milliarcsecond radio structure of LS I +61o303

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

1 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
2 Joint Institute for VLBI in Europe. Postbus 2, 7990 AA Dwingeloo, The Netherlands
3 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
4 Department of Physics and Astronomy, University of Calgary, 2500 University Dr. NW, Calgary, Alberta, T2N 1N4, Canada

Received 2 December 1997 / Accepted 7 April 1998

Abstract

We present results of two-epoch intercontinental VLBI observations at 6 cm wavelength of LS I +61o303 during an outburst in 1993. In the first epoch, the total flux density of LS I +61o303 varied from 76 to 131 mJy and the derived size of the emitting region was about 3 mas. In the second epoch, four days later, the flux density of LS I +61o303 was very stable, at a level of 60 mJy. The flux stability along all the second session allowed us to carry out standard hybrid mapping. The VLBI map obtained exhibits an extended structure of about 7 mas with an unresolved component at the center of the extended structure. The results derived from both observing sessions seem to agree with a source expanding with time from 2-3 to 7 mas, at a velocity of [FORMULA]2200 km s-1. In addition, our results suggest the existence of a quiescent component associated with the core.

Key words: stars: individual: O 303 – stars: variables: other LS I +61 – radio continuum: stars – X-rays: stars – techniques: interferometric

Send offprint requests to: J.M. Paredes

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© European Southern Observatory (ESO) 1998

Online publication: June 18, 1998
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