Fig. 12
HR diagrams for the Reddy et al. (2003, 2006) sample, the Valenti & Fischer (2005) sample, and the Adibekyan et al. (2012) sample. Overlapping stars from this study are marked by red solid circles. The α-enhanced Yonsei-Yale (Y2) isochrones by Demarque et al. (2004) have metallicities of [Fe/H] = −1 and + 0.3 dex, respectively, and are shown from 1 to 15 Gyr in steps of 1 Gyr.
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