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Recent photometric analysis of the colour-magnitude diagrams (CMDs) of youngmassive clusters (YMCs) have found evidence for splitting in the main sequenceand extended main sequence turn-offs, both of which have been suggested to becaused by stellar rotation. Comparison of the observed main sequence splittingwith models has led various authors to suggest a rather extreme stellarrotation distribution, with a minority ($10-30$\%) of stars with low rotationalvelocities and the remainder ($70-90$\%) of stars rotating near the criticalrotation (i.e., near break-up). We test this hypothesis by searching for Bestars within two YMCs in the LMC (NGC 1850 and NGC 1856), which are thought tobe critically rotating stars with decretion disks that are (partially) ionisedby their host stars. In both clusters we detect large populations of Be starsat the main sequence turn-off ($\sim30-60$\% of stars), which supports previoussuggestions of large populations of rapidly rotating stars within massiveclusters.

A high fraction of Be stars in young massive clusters: evidence for a large population of near-critically rotating stars