SIMULTANEOUS XMM-NEWTON AND UVES OBSERVATIONS OF THE FLARE STAR CN LEONIS

We propose to observe the star CN Leo (spectral type M6Ve) simultaneously withXMMNewton in the Xray and optical band (with its optical monitor) and withUVES on Kueyen to obtain timeresolved highresolution spectroscopy. CN Leo doesshow frequent flares in the Xray and optical band, hence we expect a number ofsuch events during the proposed observations. With theobservational setup thephotospheric, chromospheric and coronal energy losses of both the quiescent andflaring emission of CN Leo can be simultaneously recorded. The UVES observationswill cover the Fe XIII 3388.1 A line, which also traces the coronal emissionfrom CN Leo from the ground. With its superb spectral resolu tion (R virgul 45000) wecan study in detail the coronal and chromospheric dynamics. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]