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Multifrequency observations of AB Doradus. X-ray flaring and rotational modulation of a young star.

X-ray observations of AB Doradus, performed by the Large Area Counter instrument LAC of the GINGA satellite on January 1990, are reported. The observations covered 5 rotations of the star (2.6 days) during which 4 flares were detected. When added to the previously observed EINSTEIN and EXOSAT flares, a total of 7 X-ray flares in AB Dor have been observed so far. The flares seem to cluster around rotational phases 0.1 - 0.25 and 0.6 - 0.75 although the statistics are poor. The mean flare energies were around (1-3) × 10 34 erg with peak luminosities (4-6) × 10 30 erg/s. The flaring loops were compact (n e = 10 12 cm −3 ) and extended (1-2) × 10 10 cm above the surface. Flare masses (10 18 g) and frequencies (two per day) are similar to prominence-like cloud formations discovered previously in the star