Extended Main Sequence Turn-Offs in Low Mass Intermediate Age Clusters
  We present an imaging analysis of four low mass stellar clusters (< 5000 Mo)
in the outer regions of the LMC in order to shed light on the extended main
sequence turn-off (eMSTO) phenomenon observed in high mass clusters. The four
clusters have ages between 1-2 Gyr and two of them appear to host eMTSOs. The
discovery of eMSTOs in such low mass clusters - > 5 times less massive than the
eMSTO clusters previously studied - suggests that mass is not the controlling
factor in whether clusters host eMSTOs. Additionally, the narrow extent of the
eMSTO in the two older (~ 2 Gyr) clusters is in agreement with predictions of
the stellar rotation scenario, as lower mass stars are expected to be
magnetically braked, meaning that their CMDs should be better reproduced by
canonical simple stellar populations. We also performed a structural analysis
on all the clusters and found that a large core radius is not a requisite for a
cluster to exhibit an eMSTO.
