The Factory and the Beehive. V.

We used these data to measure the fractional H{alpha} and X-ray luminosities, LH{alpha}/Lbol and LX/Lbol, and to calculate Rossby numbers Ro. We found that at ~700Myr almost all M dwarfs exhibit H{alpha} emission, with binaries having the same overall color-H{alpha} equivalent width distribution as single stars. In the Ro-LH{alpha}/Lbol plane, unsaturated single stars follow a power law with index {beta}=-5.9{\pm}0.8 for Ro>0.3.

In the Ro-LX/Lbol plane, we see evidence for supersaturation for single stars with Ro<~0.01, following a power law with index {beta}_sup_=0.5_-0.1_^+0.2^, supporting the hypothesis that the coronae of these stars are being centrifugally stripped. We found that the critical Ro value at which activity saturates is smaller for LX/Lbol than for LH{alpha}/Lbol. Finally, we observed an almost 1:1 relation between LH{alpha}/Lbol and LX/Lbol, suggesting that both the corona and the chromosphere experience similar magnetic heating.