Spectroscopic detection of multiple populations in the ~2 Gyr old
  cluster Hodge 6 in the LMC
  We report the spectroscopic discovery of abundance spreads (i.e. multiple
populations) in the ~2 Gyr old cluster in the LMC, Hodge 6. We use low
resolution VLT FORS2 spectra of 15 member stars in the cluster to measure their
CN and CH band strengths at ~3883 and 4300 A, respectively, as well as [C/Fe]
and [N/Fe] abundances. We find a sub-population of 2 stars that are enriched in
nitrogen, and we conclude that this sub-population is evidence of multiple
populations in Hodge 6. This is the second ~2 Gyr old cluster (the first being
NGC 1978 in the LMC) to show multiple populations and the first spectroscopic
detection of MPs in a cluster of this age. This result is interesting as it
hints at a possible relationship between the disappearance of extended main
sequence turn-offs in clusters younger than ~2 Gyr and the onset of multiple
populations at ~2 Gyr, which should be explored further.
