Investigating a Dynamo Bimodality in Fully Convective Stars with X-rays

Recent observations have led to a proposed new paradigm in which fastrotatinglowmass stars host magnetic dynamos that operate in distinct strong and weakmodes; if true, there are large implications for exoplanets. Coronal Xray datahint at this effect, but no detailed studies have been done. We propose an 80virgulksinvestigation of four nearby cool dwarfs, two from each dynamo mode. All arebright Xray emitters. The two dynamo modes are associated with different levelsof variability, and XMMNewton.s large collecting area will allow a sensitivesearch for an Xray manifestation of this. We will also compare abundances andemission measures using CCD and grating spectra. Our data will test this newparadigm and may provide an important new tool for investigating it. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]