The X-Ray View of Stellar Cycles

With the advent of largescale optical monitoring and exoplanet search programs,the number of stars with known stellar cycles is growing rapidly. In parallel,advances in theoretical modeling are revolutionizing our understanding ofmagnetic field generation in latetype stars. Many questions remain, however,and new puzzles have arisen, such as the discovery of cycles in fully convectivestars. Xray emission is a powerful diagnostic of stellar magnetic activity,with cycle amplitudes that are much larger and often more regular than in otherwavebands. Of the hundreds of stars with confirmed cycles, however, only 8 havebeen monitored in X rays. We request XMM observations of two stars that willsignificantly broaden the Xray perspective on stellar cycles. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]