Hertzsprung-Russell diagram showing the two components of NY Hya (solid points) against three standard Dartmouth stellar evolution model isochrones (solid lines) and a single stellar evolution model mass track (dotted line). Isochrones are shown with the same line style to provide contrast with the individual mass track. From left to right (warmer to cooler), the isochrones are ([Fe/H], τ_age) = (+0.0, 4.4 Gyr), (+0.2, 5.7 Gyr), and (+0.4, 7.3 Gyr). The stellar evolution mass track is showing an M = 1.160 M_⊙ model with [Fe/H] = +0.4.