Coronal activity cycles in solar analog stars

The present monitoring program to identify and study for the first time thecyclic behavior of the coronal emission of stars similar to our Sun has beenongoing since XMM.s AO1. Five stars in three stellar systems have beenmonitored for over a decade, providing for the first time clear evidence oflongterm cycles in the coronal activity of normal stars. The present proposalrequests continuation of the ongoing monitoring program into AO15, needed toprogress in the understanding of the coronal behavior across different activitycycles. Our best observed targets, HD81809 and 61CygA, have both been observedthrough almost two, welldefined cycles, while a cycle is becoming evident inthe observations of alpha Cen B. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]