Multiple Populations in Integrated Light Spectroscopy of Intermediate
  Age Clusters
  The presence of star-to-star light-element abundance variations (a.k.a.
multiple populations, MPs) appears to be ubiquitous within old and massive
clusters in the Milky Way and all studied nearby galaxies. Most previous
studies have focussed on resolved images or spectroscopy of individual stars,
although there has been significant effort in the past few years to look for
multiple population signatures in integrated light spectroscopy. If proven
feasible, integrated light studies offer a potential way to vastly open
parameter space, as clusters out to tens of Mpc can be studied. We use the NaD
lines in the integrated spectra of two clusters with similar ages ($2-3$ Gyr)
but very different masses, NGC 1978 ($\sim3\times10^5$ Msun) in the LMC and
G114 ($1.7\times10^7$ Msun) in NGC 1316. For NGC 1978, our findings agree with
resolved studies of individual stars which did not find evidence for Na
spreads. However, for G114, we find clear evidence for the presence of multiple
populations. The fact that the same anomalous abundance patterns are found in
both the intermediate age and ancient GCs lends further support to the notion
that young massive clusters are effectively the same as the ancient globular
clusters, only separated in age.
