MILLIARCSECOND RADIO STRUCTURE OF LSI-DEGREES-303(61)

We present results of two-epoch intercontinental VLBI observations at 6 cm wavelength of LSI +61 degrees 303 during an outburst in 1993. In the first epoch, the total flux density of LSI +61 degrees 303 varied from 76 to 131 mJy and the derived size of the emitting region was abo ut 3 mas. In the second epoch, four days later, the flux density of LS I +61 degrees 303 was very stable, at a level of 60 mJy. The flux sta bility along all the second session allowed us to carry out standard h ybrid mapping. The VLBI map obtained exhibits an extended structure of about 7 mas with an unresolved component at the center of the extende d 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 veloci ty of similar to 2200 km s(-1). In addition, our results suggest the e xistence of a quiescent component associated with the core.