Theoretical effective temperature-mass relations from the stellar evolution model of Spada et al. (2013), with the mixing length parameter α set to 0.5. Theoretical 4 Gyr isochrones are plotted for different metallicities indicated by legend. The magenta filled box shows the GJ 436 position on the diagram according to von Braun et al. (2012)’s stellar temperature and our inferred stellar mass.
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