Radial velocities of 123 active stars

This work discusses the active sample without close binary companions, providing a comprehensive picture of these 123 stars with H{alpha} emission stronger than -1{AA}. Our analysis includes rotation periods (including 31 new measurements), H{alpha} equivalent widths, rotational broadening, inclinations, and radial velocities, determined using high-resolution, multiepoch spectroscopic data from the TRES and CHIRON spectrographs supplemented by photometry from TESS and MEarth.

Using this volume-complete sample, we establish that the majority of active, low-mass M-dwarfs are very rapid rotators: specifically, 74%{+/-}4% have rotation periods shorter than 2 days, while 19%{+/-}4% have intermediate rotation periods of 2-20 days, and the remaining 8%{+/-}3% have periods longer than 20 days. Among the latter group, we identify a population of stars with very high H{alpha} emission, which we suggest is indicative of dramatic spindown as these stars transition from the rapidly rotating mode to the slowly rotating one.