X-Ray spectroscopy of stellar coronae with BeppoSAX Original Research Article

We report on preliminary results of stellar coronae observations by BeppoSAX with emphasis on our own observations of the RS CVn binary UX Arietis and of the young rapidly rotating star AB Doradus. We discuss the temperature, emission measure distribution and elemental abundances derived from these observations and compare the results with those obtained previously by ASCA. We also report on the detection by BeppoSAX of hard (>20 keV) X-ray emission from large stellar flares, and discuss briefly possible interpretations of this detection.