Program: GN-2020B-Q-317

The newly discovered feature in the lower main-sequence marks the transition between partially and fully convective interior for M dwarfs. Although theoretical mass-luminosity relation shows a kink in this transition zone, the empirical mass-luminosity relation is smooth. Furthermore, different theoretical models predict very different mass ranges where this transition could occur. For decades, the mass of this transition zone is uncertain and often quoted as 0.35M. This is the first time we can pin point where the transition is and select suitable targets. In this work, we propose to use high resolution speckle cameras at Gemini North and South to observe nearby binary candidates close to this gap, so we can resolve close binaries to map out orbits and get dynamical masses in the future to provide key empirical results to this new discovery.