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The split main sequences (MSs) and extended MS turnoffs (eMSTOs) detected ina few young clusters have demonstrated that these stellar systems host multiplepopulations differing in a number of properties such as rotation and, possibly,age.We analyze Hubble Space Telescope photometry for thirteen clusters withages between ~40 and ~1000 Myrs and of different masses. Our goal is toinvestigate for the first time the occurrence of multiple populations in alarge sample of young clusters. We find that all the clusters exhibit the eMSTOphenomenon and that MS stars more massive than ~1.6 solar masses define a blueand red MS, with the latter hosting the majority of MS stars. The comparisonbetween the observations and isochrones suggests that the blue MSs are made ofslow-rotating stars, while the red MSs host stars with rotational velocitiesclose to the breakup value. About half of the bright MS stars in the youngestclusters are H-alpha emitters. These Be stars populate the red MS and thereddest part of the eMSTO thus supporting the idea that the red MS is made offast rotators. We conclude that the split MS and the eMSTO are a common featureof young clusters in both Magellanic Clouds. The phenomena of a split MS and aneMSTO occur for stars that are more massive than a specific threshold which isindependent of the host-cluster mass. As a by-product, we report theserendipitous discovery of a young SMC cluster, GALFOR1.

Multiple stellar populations in Magellanic Cloud clusters. VI. A survey of multiple sequences and Be stars in young clusters