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Fig. 4

image

BV vs. stellar density (solar units). The point is EPIC 210894022 with BV corrected for reddening based on the interstellar Na I absorption in the star’s spectrum. Dartmouth Stellar Evolution Program (DSEP; Dotter et al. 2008) isochrones for 8–13 Gyr-old stars with [Fe/H] = − 0.5 and [α/Fe] = +0.4 are plotted; heavy points are for those with Teff within 50 K of the spectroscopic value of 5730 K. The solid line is the 12.5 Gyr old isochrone, which minimizes the χ2 function.

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