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Observations revealed the presence of multiple stellar populations inglobular clusters (GCs) that exhibit wide abundance variations and multiplesequences in Hertzsprung-Russell (HR) diagram. We present a scenario for theformation of multiple stellar populations in GCs. In this scenario, initial GCsare single-generation clusters, and our model predicts that the abundanceanomalous stars observed in GCs are the merged stars and the accretor starsproduced by binary interactions, which are rapidly rotating stars at the momentof their formation and are more massive than normal single stars in the sameevolutionary stage. We find that due to their own evolution, these rapidlyrotating stars have different surface abundances, effective temperatures andluminosities from normal single stars in the same evolutionary stage. Thestellar population with binaries can reproduce two important observationalevidences of multiple stellar populations, the Na-O anticorrelation and themultiple sequences in HR diagram. This suggests that binary interactions may bea possible scenario for the formation of multiple stellar populations in GCs.

Binary interactions as a possible scenario for the formation of multiple stellar populations in globular clusters