Left panel: color magnitude diagram from 2MASS of stars within ~2 half-light radii of Gaia 1 (gray points). Right panel: Hertzsprung-Russell diagram, constructed from our best spectroscopic stellar parameters. Our targets are highlighted in blue, red triangles are the He-clump targets of Mucciarelli et al. (2017), and the sample of Simpson et al. (2017) is shown in black. Each panel also displays Dartmouth isochrones (Dotter et al. 2008) using an age (6.3 Gyr) and metallicity (−0.7 dex), as suggested by Koposov et al. (2017, dashed line), and one with 12 Gyr and −0.65 dex (solid line).
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