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Recent work has shown that the properties of multiple populations withinmassive stellar clusters (i.e., in the extent of their abundance variations aswell as the fraction of stars that show the anomalous chemistry) depend on themass as well as the age of the host cluster. Such correlations are largelyunexpected in current models for the formation of multiple populations andhence provide essential insight into their origin. Here we extend or previousstudy into the presence or absence of multiple populations using integratedlight spectroscopy of the $\sim600$~Myr, massive ($\sim10^7 - 10^8$~\msun)clusters, W3 and W30, in the galactic merger remnant, NGC 7252. Due to theextreme mass of both clusters, the expectation is that they should host ratherextreme abundance spreads, manifested through, e.g., high mean [Na/Fe]abundances. However, we do not find evidence for a strong [Na/Fe] enhancement,with the observations being consistent with the solar value. This suggests thatage is playing a key role, or alternatively that multiple populations onlymanifest below a certain stellar mass, as the integrated light at all agesabove $\sim100$~Myr is dominated by stars near or above the main sequenceturn-off.

Searching for Multiple Populations in the Integrated Light of the Young and Extremely Massive Clusters in the Merger Remnant NGC~7252