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Multiple stellar populations are a widespread phenomenon among Galacticglobular clusters. Even though the origin of the enriched material from whichnew generations of stars are produced remains unclear, it is likely thatself-enrichment will be feasible only in clusters massive enough to retain thisenriched material. We searched for multiple populations in the low mass (M~1.4x 10^4 M_sun) globular cluster E 3, analyzing SOAR/Goodman multi-objectspectroscopy centered on the blue CN absorption features of 23 red giant branchstars. We find that the CN abundance does not present the typical bimodalbehavior seen in clusters hosting multi stellar populations, but rather aunimodal distribution that indicates the presence of a genuine single stellarpopulation, or a level of enrichment much lower than in clusters that showevidence for two populations from high-resolution spectroscopy. E 3 would bethe first bona fide Galactic old globular cluster where no sign ofself-enrichment is found.

No evidence for multiple stellar populations in the low-mass Galactic globular cluster E 3