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Not-so-simple stellar populations in nearby, resolved massive star clusters

Event details of Richard de Grijs
Date 6 September 2017
Time 11:00 -12:00
Richard de Grijs

Until about a decade ago, star clusters were considered "simple" stellar populations: all stars in a cluster were thought to have similar ages and the same chemical composition. Only the individual stellar masses were thought to vary, in essence conforming to a "universal" initial mass function imprinted by their birth processes. Over the past decade, this situation has changed dramatically.

I will discuss my group's exciting recent achievements in this context, with particular emphasis on the properties and the alleged presence of so-called multiple stellar populations in star clusters in the Milky Way and the nearest galaxies across the full age range, from a few tens of millions of years to a few billion years. Our most recent results imply a reverse paradigm shift, back to the old simple stellar population picture for at least some intermediate-age (~2 billion-year-old) star clusters, which opens up exciting avenues for future research efforts.