Kepler 63: a young star as an enrichment of X-ray activity cycle studies

Chromospheric activity cycles are often found in old stars, but their coronal Xray counterparts have been difficult to catch. Thanks to XMMNewton, Xraycycles have been detected in four stars, moving forward an exploration of theparameters space of dynamo cycles (activity level, cycle length, etc.). Twostars with known Xray activity cycles are relatively young (500Myr), rising thequestion at what age and activity level Xray cycles set in. We propose here 4short (6ksec) observations of Kepler63. It is younger (250Myr), has higheractivity (logLx29.02erg/s) and a shorter cycle (1.27yr) that the previoustargets for such dedicated studies. A single XMMNewton observing season cancover 1/2 of a full cycle with short snapshots. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]