MODELING OF LSI-DEGREES-303 FROM NEAR-INFRARED DATA(61)

We present a scenario in an attempt to account for the observed behavi or of the periodic radiostar LSI+61 degrees 303 in different wavelengt h domains, from radio to X-rays. Our interpretation is based on modell ing our previous observations of the LSI+61 degrees 303 near infrared light curve, which allows us to estimate the orbital eccentricity and phase of periastron passage. This information, together with the circu mstellar envelope parameters derived from the observed infrared excess , is used in order to study the occurrence of supercritical accretion events leading to periodic radio outbursts. A possible interpretation of the 4 yr modulation of the radio outburst peak is also proposed.