SIMBAD references

In this paper the flaring activity of the active binary system UX Arietis is investigated by analysing some radio spectra acquired by the Effelsberg 100-m radiotelescope. These spectra are characterized by positive spectral indexes, and show the evolution of the emission during the flare rising phases. The usual interpretation in terms of gyrosynchrotron emission from relativistic electrons trapped in a bipolar magnetic field and undergoing collisional and radiative losses does not fit these data. For this reason a continuous injection of accelerated particles has been included in the model. The computed spectra evolve in time in agreement with available observations.