Spectroscopic studies of stellar populations in globular clusters and field stars: implications for globular cluster and Milky Way halo formation
arXiv:1908.06905 · doi:10.1017/S1743921319007877
Abstract
We review spectroscopic results concerning multiple stellar populations in globularclusters. The cluster initial mass is the most important parameter determining the fraction of second generation stars. The threshold for the onset of the multiple population phenomenon is 1-3x10^5 MSun. Nucleosynthesis is influenced by metallicity: Na/O and Mg/Al anti-correlations are more extended in metal-poor than in metal-rich clusters. Massive clusters are more complex systems than the smaller ones, with several populations characterized by different chemical compositions. The high Li abundance observed in the intermediate second generation stars strongly favours intermediate mass AGB stars as polluters for this class of stars; however, it is well possible that the polluters of extreme second generation stars, that often do not have measurable Li, may be fast rotating massive stars or super-massive stars. The mass budget factor should be a function of the cluster mass, and needs to be large only in massive clusters.
arXiv comment10 pages, 5 figures; In Star Clusters: From the Milky Way to the Early Universe, Proceedings IAU Symposium No. 351, 2019, A. Bragaglia, M.B. Davies, A. Sills & E. Vesperini, eds
References in corpus (25)
- Multiple Stellar Populations in Globular Clusters
- Formation and Dynamical Evolution of Multiple Stellar Generations in Globular Clusters
- A catalogue of masses, structural parameters and velocity dispersion profiles of 112 Milky Way globular clusters
- Predictions for self-pollution in globular cluster stars
- Mean proper motions, space orbits and velocity dispersion profiles of Galactic globular clusters derived from Gaia DR2 data
- Formation of omega Centauri from an ancient nucleated dwarf galaxy in the young Galactic disc
- The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. V. Constraints on Formation Scenarios
- Super-Massive Stars as a Source of Abundance Anomalies of Proton-Capture Elements in Globular Clusters
- Multiple stellar populations in 47 Tucanae
- Concurrent formation of supermassive stars and globular clusters: implications for early self-enrichment
- M 54 + Sagittarius = omega Centauri
- The Abundance Spread Among Giants and Subgiants in the Globular Cluster Omega Centauri
- The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XIX. A Chemical Tagging of the Multiple Stellar Populations Over the Chromosome Maps
- The Unusual Initial Mass Function of the Arches Cluster
- Lithium abundance in the globular cluster M4: from the Turn-Off to the RGB Bump
- Origin of Abundance Inhomogeneity in Globular Clusters
- The search for multiple populations in Magellanic Cloud Clusters IV: Coeval multiple stellar populations in the young star cluster NGC 1978
- The HST Large Program on Omega Centauri. I. Multiple stellar populations at the bottom of the main sequence probed in NIR-Optical
- Lithium and proton-capture elements in Globular Cluster dwarfs: the case of 47 Tuc
- The Relationship Between Globular Cluster Mass, Metallicity, and Light Element Abundance Variations
- Giants reveal what dwarfs conceal: Li abundance in lower RGB stars as diagnostic of the primordial Li
- Lithium abundances in globular cluster giants: NGC 1904, NGC 2808, and NGC 362
- Lithium abundances in red giants of M4: evidence for asymptotic giant branch star pollution in globular clusters?
- Lithium abundances in globular cluster giants: NGC 6218 (M12) and NGC 5904 (M5)
- Models for the lithium abundances of multiple populations in globular clusters and the possible role of the Big Bang lithium