We present a photometric survey aimed to characterize the Be star population
of young open clusters. It is found that in these clusters early-type Be stars
are more frequent than in the galactic field, and late-type Be stars are scarce
or inexistent. We interpret this result as evidence for an evolutionary
enhancement of the Be phenomenon towards the end of the main sequence lifetime.Comment: 6 pages, to be published in ASP Conference Series "Interplay between
periodic, cyclic and stochastic variability in selected areas of the H-R
diagram", C. Sterken, E
