Abstract
I will present light curves of a variety of stellar X-ray sources obtained in the ROSAT all-sky survey and in the ROSAT pointed program. The sources discussed in detail are the white dwarfs Sirius B and V471 Tauri, the flare stars EV Lac and YY Gem, as well as the RS CVn System AR Lac. X-ray flares are reported in the cases of EV Lac and YY Gem, eclipses in the cases of V471 Tauri, YY Gem and AR Lac.Keywordswhite dwarfslate-type starsstellar coronaeX-rays
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