Mass tracks from Y² models of Demarque et al. (2004) interpolated to [Fe/H] = − 0.4 (solid lines) for five different masses. The grey bands around each track indicate the range of properties at those masses, which are consistent with the uncertainty on the metallicity. The values for the radius and temperature of the primary star are plotted as the solid circle with uncertainties. Through this comparison with the stellar evolution models, we find the mass of the primary star to be 0.945 ± 0.045M_⊙.