An explanation for the gap in the Gaia HRD for M dwarfs

Abstract

We show that the recently discovered narrow gap in the Gaia Hertzsprung - Russell Diagram near MG =10 can be explained by standard stellar evolution models and results from a dip in the luminosity function associated with mixing of 3He during merger of envelope and core convection zones that occurs for a narrow range of masses.

To appear in MNRAS

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• The M-dwarf Ultraviolet Spectroscopic Sample I. Determining Stellar Parameters for Field Stars