An Extragalactic Chromosome Map: The intermediate age SMC Cluster
  Lindsay 1
  The discovery of star-to-star abundance variations (a.k.a. multiple
populations - MPs) within globular clusters (GCs), which are generally not
found in the field or in lower mass open clusters, has led to a search for the
unique property of GCs that allow them to host this phenomenon. Recent studies
have shown that MPs are not limited to the ancient GCs but are also found in
massive clusters with ages down to (at least) 2 Gyr. This finding is important
for understanding the physics of the MP phenomenon, as these young clusters can
provide much stronger constraints (e.g. on potential age spreads within the
clusters) than older ones. However, a direct comparison between ancient GCs and
intermediate clusters has not yet been possible due to the different filters
adopted in their studies. Here we present new HST UV photometry of the 7.5 Gyr,
massive SMC cluster, Lindsay 1, in order to compare its pseudo colour-colour
diagram to that of Galactic GCs. We find that they are almost identical and
conclude that the MPs phenomenon is the same, regardless of cluster age and
host galaxy.
