Studying Stellar Activity with a XMM-Kepler Joint Project

We propose to survey 3 sq. deg. of sky within the Kepler target area with 12 XMMpointing of 80 ksec each. We will take advantage of the unprecedented accuracy,duration and duty cycle of the whitelight lightcurves (LCs), obtained byKepler on a large, statistically meaningful stellar sample. These allow us toreliably determine the rotational periods of slow rotators and to obtainsimultaneous optical and Xrays observations. The proposed observations willallow us i) to derive the size of active regions in a large sample of stars(hundreds, spanning different activity regimes), ii) to constrain coronalheating mechanisms and iii) to explore the slow rotation regime in low massstars, using a variety of diagnostics described in the proposal. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]