Neutron-capture elements in NGC 6752 multiple populations

Abstract

Globular clusters have been widely studied in terms of light element variations present in their different stellar populations. However, the nature of the polluter(s) responsible for this phenomenon is still debated. The study of heavy elements and their relation to light ones can provide further constraints. In particular, we aim to explore the possible contribution of asymptotic giant branch stars of different stellar masses to the internal pollution in the cluster. We derive abundances of elements from different nucleosynthetic chains, such as Na, Mg, Ca, Sc, Cu, Y, and Ba. We did not find clear relations between the light s-process elements (represented by Y II) or heavy ones (represented by Ba II) with light elements (Li, Na or Al). This indicates that the polluter(s) responsible for the Na (Al) or Li production does not produce large amounts of Y II and Ba II. Furthermore, the comparison with models discards a possible significant contribution to the cluster pollution from AGB stars with masses lower than 5M${}_{\odot }$. In addition, we found a potential CH-star in our sample.

arXiv comment12 pages, 17 figures

References in corpus (54)

• The chemical composition of the Sun
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Na-O Anticorrelation and HB. VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra
• Stellar Chemical Signatures And Hierarchical Galaxy Formation
• Intrinsic iron spread and a new metallicity scale for Globular Clusters
• Multiple Stellar Populations in Globular Clusters
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• Na-O Anticorrelation and HB. VIII. Proton-capture elements and metallicities in 17 globular clusters from UVES spectra
• Properties of stellar generations in Globular Clusters and relations with global parameters
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. IX. The Atlas of Multiple Stellar Populations
• Predictions for self-pollution in globular cluster stars
• Massive binaries as the source of abundance anomalies in globular clusters
• Evolution, nucleosynthesis and yields of low mass AGB stars at different metallicities (II): the FRUITY database
• Non-LTE calculations for neutral Na in late-type stars using improved atomic data
• Evolution, nucleosynthesis and yields of AGB stars at different metallicities (III): intermediate mass models, revised low mass models and the ph-FRUITY interface
• A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)
• The Abundances of Neutron Capture Species in the Very Metal-Poor Globular Cluster M15: An Uniform Analysis of RGB and RHB Stars
• What is a globular cluster? An observational perspective
• The nucleus of the Sagittarius dSph galaxy and M54: a window on the process of galaxy nucleation
• Atomic Diffusion and Mixing in Old Stars I. VLT/FLAMES-UVES Observations of Stars in NGC 6397
• Hot Horizontal-Branch Stars: The Ubiquitous Nature of the "Jump" in Stromgren u, Low Gravities, and the Role of Radiative Levitation of Metals
• Origin of the abundance patterns in Galactic globular clusters: constraints on dynamical and chemical properties of globular clusters
• Multiple stellar populations in the globular cluster NGC 1851
• Abundances in giant stars of the globular cluster NGC 6752
• Building the Galactic halo from globular clusters: evidence from chemically unusual red giants
• Iron and neutron-capture element abundance variations in the globular cluster M2 (NGC 7089)
• Abundances for metal-poor stars with accurate parallaxes II. alpha-elements in the halo
• The Bizarre Chemical Inventory of NGC 2419, An Extreme Outer Halo Globular Cluster
• The origin and evolution of the odd-Z iron-peak elements Sc, V, Mn, and Co in the Milky Way stellar disk
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XIX. A Chemical Tagging of the Multiple Stellar Populations Over the Chromosome Maps
• Heavy-element yields and abundances of Asymptotic Giant Branch models with a Small Magellanic Cloud metallicity
• Na-O Anticorrelation and HB. II. The Na-O anticorrelation in the globular cluster NGC 6752
• linemake: An Atomic and Molecular Line List Generator
• Lithium abundance in the globular cluster M4: from the Turn-Off to the RGB Bump
• The metallicity spread and the age-metallicity relation of Omega Centauri
• Chemical tagging of three distinct populations of red giants in the globular cluster NGC 6752
• Ba stars and other binaries in first and second generation stars in globular clusters
• Ba & Eu Abundances in M15 giant stars
• Atomic diffusion and mixing in old stars IV: Weak abundance trends in the globular cluster NGC 6752
• Heavy elements in Globular Clusters: the role of AGB stars
• Super AGB and AGB evolution and the chemical inventory in NGC 2419
• The incidence of binaries in Globular Cluster stellar populations
• Atomic Diffusion and Mixing in Old Stars V: A deeper look into the Globular Cluster NGC 6752
• 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?
• No Heavy Element Dispersion in the Globular Cluster M92
• Lithium abundances in globular cluster giants: NGC 6218 (M12) and NGC 5904 (M5)
• On the internal pollution mechanisms in the globular cluster NGC 6121 (M4): heavy-element abundances and AGB models
• The s-Process Enrichment of the Globular Clusters M4 and M22
• Excess of Ca (and Sc) produced in globular cluster multiple populations: a first census in 77 Galactic globular clusters
• The Globular Cluster Origin of the Milky Way Outer Bulge: Evidence from Sodium Bimodality
• The Lithium test for multiple populations in Globular Clusters: Lithium in NGC 2808
• Cobalt and copper abundances in 56 Galactic bulge red giants
• Lithium abundances as a tracer of AGB stars pollution in the globular cluster NGC 6752

Cited by in corpus (2)

• Chemistry of multiple stellar populations in the mono-metallic, in situ, bulge globular cluster NGC 6388
• Neutron-Capture Element Signatures in Globular Clusters: Insights from the Gaia-ESO Survey