Wolf 424: A Neglected Flare Star

Four-colour high-speed photometric observations of the UV Ceti type flare star Wolf 424AB are presented. This system may be one of the most active flare stars known. During a period of 2.62 hr 12 flares were detected and flare activity accounted for approximately 8 per cent of the total energy received from the system in the U-bandpass. The observations of the largest flare are compared with the predictions of the fast-electron flare model proposed by Gurzadyan which is remarkably successful though some discrepancies exist. The basic hypothesis of the fast-electron model is questioned.