Best-fit T_eff and log g for Star 1 (α Tau) converted to luminosity, using three different mass values (triangles up – 0.6 M_⊙, squares – 1.1 M_⊙, triangles down – 1.6 M_⊙), and direct T_eff and log g values from Table 1 (black cross with error bars). Solid lines are evolutionary tracks for Z = 0.008 and Y = 0.26 by the Padova group (Bertelli et al. 2008, 2009), labelled to the left with mass in solar masses.