Fractional stellar convection zone depth and the generation of magnetic flux: an empirical approach

The author presents preliminary results from an observational investigation of very late M dwarf stars utilizing the Multiple Mirror Telescope facility. He finds that dwarf stars later than spectral type M5 do not necessarily exhibit Hα line emission. The preliminary results discussed tentatively suggest, but do not prove, that the generation of significant magnetic fields and magnetic flux is severely inhibited in fully convective stars. (Auth.)