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Bastian, S. de Mink","submitted_at":"2016-11-21T10:04:30Z","abstract_excerpt":"Recent photometric analysis of the colour-magnitude diagrams (CMDs) of young massive clusters (YMCs) have found evidence for splitting in the main sequence and extended main sequence turn-offs, both of which have been suggested to be caused by stellar rotation. Comparison of the observed main sequence splitting with models has led various authors to suggest a rather extreme stellar rotation distribution, with a minority ($10-30$\\%) of stars with low rotational velocities and the remainder ($70-90$\\%) of stars rotating near the critical rotation (i.e., near break-up). 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