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We present a new method to determine the age spread of resolved stellarpopulations in a starburst cluster. The method relies on a two-step process. Inthe first step, kinematic members of the cluster are identified based onmulti-epoch astrometric monitoring. In the second step, a Bayesian analysis iscarried out, comparing the observed photometric sequence of cluster memberswith sets of theoretical isochrones. When applying this methodology to opticaland near-infrared high angular resolution Hubble Space Telescope (HST) andadaptive optics observations of the ~5 Myr old starburst cluster Westerlund 1and ~2 Myr old starburst cluster NGC 3603 YC, we derive upper limits for theage spreads of 0.4 and 0.1 Myr, respectively. The results strongly suggest thatstar formation in these starburst clusters happened almost instantaneously.

Instantaneous starburst of the massive clusters Westerlund 1 and NGC 3603 YC