Multiple Populations in Globular Clusters as Seen by APOGEE
Szabolcs Mészáros
ELTE Gothard Astrophysical Observatory, Szombathely

During most of the 20th century it was believed that globular clusters exhibit only one generation of stars. However, detailed photometric and spectroscopic studies of Galactic globular clusters over the past 30 yr have revealed great complexity and star-to-star variations in the elemental abundances in almost all GCs. These large variations are generally interpreted as the result of chemical feedback from an earlier generation of stars. In this talk, I will overview the results from the APOGEE survey, which led to the creation of the largest study to date of the chemical makeup of globular clusters. This unprecedented homogeneous data set (2283 stars in 31 clusters) allowed us to discuss the intrinsic Fe spread, the shape, and statistics of Al-Mg and N-C anti-correlations as a function of cluster mass, luminosity, age, and metallicity in more detail than ever before.

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