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• W2091790540 abstract "The globular star clusters that orbit the Milky Way are regarded as the best approximations we have of stellar populations of uniform age and identical composition, recording stellar evolution since the birth of our Galaxy. The most luminous of these clusters though, ω Centauri, has long been recognized as an exception to this trend, containing multiple stellar populations with a significant spread in iron abundance and ages. Two groups report the discovery of further global clusters with mixed populations. Lee et al. confirm the suspicion that the massive global cluster M22 contains distinct multiple populations with different calcium abundances, as do several other clusters in their sample. Ferraro et al. report that Terzan 5, a globular cluster-like system in the Galactic bulge, has two populations with different iron content and ages. These findings suggest that ω Cen, M22, Terzan 5 and other similar clusters are the relics of dwarf galaxies and other primordial bodies that merged to eventually form the Milky Way. The globular star clusters ω Centauri and M 22 are thought to be the remaining cores of disrupted dwarf galaxies, but they are viewed as exceptional. Here, calcium abundances for seven globular clusters are reported and compared to ω Centauri. The results lead the authors to conclude that these globular clusters are also probably the relics of more massive primeval dwarf galaxies that merged and disrupted to form the proto-Galaxy. The most massive globular cluster in the Milky Way, ω Centauri, is thought to be the remaining core of a disrupted dwarf galaxy1,2, as expected within the model of hierarchical merging3,4. It contains several stellar populations having different heavy elemental abundances supplied by supernovae5—a process known as metal enrichment. Although M 22 appears to be similar to ω Cen6, other peculiar globular clusters do not7,8. Therefore ω Cen and M 22 are viewed as exceptional, and the presence of chemical inhomogeneities in other clusters is seen as ‘pollution’ from the intermediate-mass asymptotic-giant-branch stars expected in normal globular clusters9. Here we report Ca abundances for seven globular clusters and compare them to ω Cen. Calcium and other heavy elements can only be supplied through numerous supernovae explosions of massive stars in these stellar systems10, but the gravitational potentials of the present-day clusters cannot preserve most of the ejecta from such explosions11. We conclude that these globular clusters, like ω Cen, are most probably the relics of more massive primeval dwarf galaxies that merged and disrupted to form the proto-Galaxy." @default.
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• W2091790540 date "2009-11-01" @default.
• W2091790540 modified "2023-09-28" @default.
• W2091790540 title "Enrichment by supernovae in globular clusters with multiple populations" @default.
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• W2091790540 doi "https://doi.org/10.1038/nature08565" @default.
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