A view of the H-band light-element chemical patterns in Globular Clusters under the AGB self-enrichment scenario

Abstract

We discuss the self-enrichment scenario by AGB stars for the formation of multiple populations in globular clusters (GCs) by analyzing data set of giant stars observed in 9 Galactic GCs, covering a wide range of metallicities and for which the simultaneous measurements of C, N, O, Mg, Al, Si are available. To this aim we calculated 6 sets of AGB models, with the same chemical composition as the stars belonging to the first generation of each GC. We find that the AGB yields can reproduce the set of observations available, not only in terms of the degree of contamination shown by stars in each GC but, more important, also the observed trend with metallicity, which agrees well with the predictions from AGB evolution modelling. While further observational evidences are required to definitively fix the main actors in the pollution of the interstellar medium from which new generation of stars formed in GCs, the present results confirm that the gas ejected by stars of mass in the range $4{\mathrm{M}}_{\odot }\le \mathrm{M}\le 8{\mathrm{M}}_{\odot }$ during the AGB phase share the same chemical patterns traced by stars in GCs.

22 pages and 11 figures; accepted for publication in MNRAS

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• Direct capture cross section and the $E_p$ = 71 and 105 keV resonances in the ${}^{22}$Ne($p,\gamma$)${}^{23}$Na reaction
• H-band discovery of additional Second-Generation stars in the Galactic Bulge Globular Cluster NGC 6522 as observed by APOGEE and Gaia
• Isochrone fitting of Galactic globular clusters - I. NGC 5904
• MgAl burning chain in Omega Centauri
• New Post-AGB star models as tools to understand AGB evolution and nucleosynthesis
• Chemical evolution of the metal poor Globular Cluster NGC 6809
• Magnesium isotopes: a tool to understand self-enrichment in Globular Clusters
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• The intense production of silicates during the final AGB phases of intermediate mass stars
• HST observations of the globular cluster NGC 6402 (M14) and its peculiar multiple populations
• Characterization of M-stars in the LMC in the JWST era
• Chemical analysis of the Bulge Globular Cluster NGC 6553
• Self-enrichment in Globular Clusters: the extreme He-rich population of NGC 2808
• Planetary Nebulae of the Large Magellanic Cloud II: the connection with the progenitors' properties
• Noble gases Neon and argon: a role for the chemical patterns of multiple populations in globular clusters?