HR diagram of δ Lyr cluster. The triangles and squares denote the primary and secondary components, respectively. Black dots represent the stars in the field of the cluster and the big blue dots, the stars having high membership probability. Padova isochrones taken from Bertelli et al. (2009) are shown for the reddening of 0m.06 and the apparent distance modulus of 7m.98. The isochrones shown are for 25 (red line) and 32 (blue line) Myrs and for the chemical composition (y,z) = (0.3,0.017).
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