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The optical integrated spectra of three LMC young stellar clusters (NGC 1984,NGC 1994 and NGC 2011) exhibit concave continua and prominent molecular bandswhich deviate significantly from the predictions of single stellar population(SSP) models. In order to understand the appearance of these spectra, we createa set of young stellar population (MILES) models, which we make available tothe community. We use archival International Ultraviolet Explorer integrated UVspectra to independently constrain the cluster masses and extinction, and ruleout strong stochastic effects in the optical spectra. In addition, we alsoanalyze deep colour-magnitude diagrams of the clusters to provide independentage determinations based on isochrone fitting. We explore hypotheses includingage-spreads in the clusters, a top-heavy initial mass function, different SSPmodels and the role of red supergiant stars (RSG). We find that the strongmolecular features in the optical spectra can only be reproduced by modeling anincreased fraction of about 20 per cent by luminosity of RSG above what ispredicted by canonical stellar evolution models. Given the uncertainties instellar evolution at Myr ages, we cannot presently rule-out the presence of Myrage-spreads in these clusters. Our work combines different wavelengths as wellas different approaches (resolved data as well as integrated spectra for thesame sample) in order to reveal the complete picture. We show that eachapproach provides important information but in combination can we betterunderstand the cluster stellar populations.

Young LMC clusters: the role of red supergiants and multiple stellar populations in their integrated light and CMDs