Positions of VAS 20 (asterisk) and VAS 87 (diamond) in the HR-diagram in comparison with evolutionary tracks (bottom panel) and isochrones (top panel). In both panels the ZAMS is indicated by a dotted line. Evolutionary tracks for PMS stars with masses of 2.25 M/M_⊙, 2.00 M/M_⊙, 1.75 M/M_⊙, and 1.50 M/M_⊙ are shown by a solid, dashed, dash-dotted, and dash-triple dotted line. Isochrones with ages of 10 Myr, 8 Myr, 6 Myr, and 2 Myr are shown by a solid, dashed, dash-dotted, and dash-triple-dotted line. The borders of the γ Doradus instability strip (Dupret et al. 2004) are marked with thick solid lines.