Fig. 1.
Upper panel: Teff − R diagram for M15 data (including error bars). The solid lines show the fitted linear relationships discussed in the text. Lower panel: Teff − R relationships from theoretical VLM models. Dot-dashed, solid, and dashed lines display 10 Gyr BaSTI-IAC models with [Fe/H] = +0.45, +0.06 and −0.60, respectively. The dotted line shows BASTI-IAC 1 Gyr, [Fe/H] + 0.06 models, while the open circles display the Baraffe et al. (2015) results for 10 Gyr and [Fe/H] = 0.0.
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