Candidate stars parameters in Praesepe & a Persei

We investigate the Bohm-Vitense gap, which has been found as a prominent feature in the stellar sequence of open clusters. Using PARSEC isochrone fitting, we derive astrophysical parameters for more than 1100 bona fide single stars each in Praesepe, identify more than 1100 bona fide single stars in the {alpha} Persei (Melotte 20) open cluster, and confirm their approximate match in terms of age (~710 and ~45Myr) and metallicity ([M/H] ~+0.15 and ~+0.13 dex) to the Hyades and Pleiades, respectively.

By merging data of the cluster pairs, we improve number statistics. We do not find a clear gap in the combined observational Gabs versus BP - RP color-magnitude diagram (CMD) in the stellar mass range corresponding to the location of the Bohm-Vitense gap. We reproduce gaps in simulated Hyades-type CMDs randomly drawn from an initial mass function.