Dynamical Masses and Stellar Evolutionary Model Predictions of M Stars

In this era of Gaia and ALMA, dynamical stellar mass measurements provide benchmarks that are independent observations characteristics their uncertainties. These can then be used to validate improve evolutionary models, which lead both imprecise inaccurate predictions for pre-main-sequence, low-mass stars. We present the masses derived from disks around three M-stars (FP Tau, J0432+1827, J1100-7619) using ALMA $^{12}$CO (J=2--1) $^{13}$CO emission. first J0432+1827 J1100-7619 most precise measurement FP Tau. Fiducial model tracks, do not include any treatment magnetic activity, agree with but underpredict by $\sim$60\% Tau $\sim$80\% J1100-7619. Possible explanations underpredictions assumptions effective temperature, undetected binarity J1100-7619, fiducial models complex enough represent these former case, temperatures would need increased $\sim$40K $\sim$340K reconcile dynamically-measured masses. latter we show reproduced results starspots, incorporate fractional starspot coverage manifestation activity. Folding in literature assuming accurate, find tentative evidence a relationship between observed temperature young, cool