HR diagram of HD 344787 and Polaris together with the other candidate first-crossing DCEPs (see labels). The figure also reports MW Li-rich DCEPs from Catanzaro et al. (2020). The ISs for F (solid lines) and FO (dashed lines) DCEPs are over-plotted in black for Z = 0.02 (De Somma et al. 2020) and in light violet for Z = 0.008 (Bono et al. 2001). The evolutionary tracks by Bressan et al. (2012) with Z = 0.014 and Y = 0.273 for 5 and 6 M_⊙, encompassing the location of Polaris and HD 344787 in the HRD, are displayed in red. Additional tracks for 3, 4, 7, and 9 M_⊙ are over-plotted on the data in grey.