Abundances in giant stars of the globular cluster NGC 6752

Abstract

Recent theoretical yields and chemical evolution models demonstrate that intermediate-mass AGB stars cannot reproduce the observed abundance distributions of O, Na, Mg, and Al. As a further observational test of this finding, we present elemental abundance ratios [X/Fe] for 20 elements in 38 bright giants of the globular cluster NGC 6752. Our mean abundance ratios [X/Fe] are in good agreement with previous studies of this cluster and are also consistent with other globular clusters and field stars at the same metallicity. The mean abundance ratios [Ba/Eu] and [La/Eu] exhibit values, in agreement with field stars at the same metallicity, that lie approximately midway between the pure r-process and the solar (s-process + r-process) mix, indicating that AGB stars have played a role in the chemical evolution of the proto-cluster gas. For the first time, we find possible evidence for an abundance variation for elements heavier than Al in this cluster. We find a correlation between [Si/Fe] and [Al/Fe] which is consistent with the abundance anomalies being synthesized via proton captures at high temperatures. Leakage from the Mg-Al chain into 28Si may explain the Si excess in stars with the highest [Al/Fe]. We identify correlations between [Y/Fe] and [Al/Fe], [Zr/Fe] and [Al/Fe], and [Ba/Fe] and [Al/Fe] suggesting that Y, Zr, and Ba abundances may increase by about 0.1 dex as Al increases by about 1.3 dex. While the correlations are statistically significant, the amplitudes of the variations are small. If the small variations in Y, Zr, and Ba are indeed real, then the synthesis of the Al anomalies must have taken place within an unknown class of stars that also ran the s-process. [Abridged]

Accepted for publication in A&A

References in corpus (46)

• The New Galaxy: Signatures of its Formation
• The Chemical Compositions of Galactic Disk F and G Dwarfs
• Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
• Abundances for Globular Cluster Giants: I. Homogeneous Metallicities for 24 Clusters
• Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-Poor Giants
• The Extremely Metal-Poor, Neutron-Capture-Rich Star CS 22892-052: A Comprehensive Abundance Analysis
• The O-Na and Mg-Al Anticorrelations in Turn-Off and early Subgiants in Globular Clusters
• Abundances and Kinematics of Field Halo and Disk Stars I: Observational Data and Abundance Analysis
• The extreme r-element rich, iron-poor halo giant CS31082-001: Implications for the r-process site(s) and radioactive cosmochronology
• The Galactic Thick Disk Stellar Abundances
• The Rise of the s-Process in the Galaxy
• Distances and ages of NGC 6397, NGC 6752 and 47 Tuc
• A Globular Cluster Metallicity Scale Based on the Abundance of Fe II
• The r-Process Enriched Low Metallicity Giant HD 115444
• Star-to-Star Abundance Variations among Bright Giants in the Mildly Metal-Poor Globular Cluster M4
• Abundances of 30 elements in 23 metal-poor stars
• Evidence of Multiple r-Process Sites in the Early Galaxy: New Observations of CS 22892-052
• R-Process Abundances and Chronometers in Metal-Poor Stars
• Abundances in a Large Sample of Stars in M3 and M13
• Hot Horizontal-Branch Stars: The Ubiquitous Nature of the "Jump" in Stromgren u, Low Gravities, and the Role of Radiative Levitation of Metals
• Abundances in Stars from the Red Giant Branch Tip to Near the Main Sequence Turn Off in M71: III. Abundance Ratios
• New Analyses of Star-to-Star Abundance Variations Among Bright Giants in the Mildly Metal-Poor Globular Cluster M5
• The Chemical Composition Contrast between M3 and M13 Revisited: New Abundances for 28 Giant Stars in M3
• The Kr85 s-process Branching and the Mass of Carbon Stars
• Abundances of C, N, O in slightly evolved stars in the globular clusters NGC 6397, NGC 6752 and 47 Tuc
• Pal 12 As A Part of the Sgr Stream; the Evidence From Abundance Ratios
• Mg isotopic ratios in giant stars of the globular cluster NGC 6752
• Modelling self-pollution of globular clusters from AGB stars
• The Sgr dSph hosts a metal-rich population
• C and N Abundances in Stars At the Base of the Red Giant Branch in M5
• Reconstructing Galaxy Histories from Globular Clusters
• Abundances in Stars from the Red Giant Branch Tip to Near the Main Sequence Turn Off in M5
• Comparison between predicted and empirical DV(Bump -HB) in Galactic Globular Clusters
• The Abundance Evolution of Oxygen, Sodium and Magnesium in Extremely Metal-Poor Intermediate Mass Stars: Implications for the Self-Polution Scenario in Globular Clusters
• Rubidium in Metal-Deficient Disk and Halo Stars
• A Model for Abundances in Metal-Poor Stars
• The Isotopic Mixture of Barium in the Metal-poor Subgiant HD 140283
• Europium Isotopic Abundances in Very Metal-poor Stars
• Accretion of gas by globular cluster stars
• A Comparison of Copper Abundances in Globular Cluster and Halo Field Giant Stars
• Carbon Abundances of Faint Stars in M13 - Evidence for Two Abundance Altering Mechanisms
• Heavy elements and chemical enrichment in globular clusters
• The Spectra of Main Sequence Stars in Galactic Globular Clusters II. CH and CN Bands in M71
• Measurement of the Europium Isotope Ratio for the Extremely Metal-Poor, r-Process-Enhanced Star CS31082-001
• Heavy elements abundances in turn-off stars and early subgiants in NGC 6752
• Hydra Observations of Aluminum Abundances in the Red Giants of the Globular Clusters M80 and NGC 6752

Cited by in corpus (114)

• Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters
• Na-O Anticorrelation and HB. VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra
• Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
• Multiple Stellar Populations in Globular Clusters
• 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
• Chemical Abundances for 855 Giants in the Globular Cluster Omega Centauri (NGC 5139)
• The second and third parameters of the Horizontal Branch in Globular Clusters
• Detailed abundances of a large sample of giant stars in M 54 and in the Sagittarius nucleus
• Abundance patterns of multiple populations in Globular Clusters: a chemical evolution model based on yields from AGB ejecta
• Segue 1: An Unevolved Fossil Galaxy from the Early Universe
• Chemical similarities between Galactic bulge and local thick disk red giants: O, Na, Mg, Al, Si, Ca and Ti
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVI. The helium abundance of multiple populations
• From dawn till disk: Milky Way's turbulent youth revealed by the APOGEE+Gaia data
• The remarkable solar twin HIP 56948: a prime target in the quest for other Earths
• The Ubiquity of the Rapid Neutron-Capture Process
• A WFC3/HST view of the three stellar populations in the Globular Cluster NGC6752
• Multiple stellar populations in the globular cluster NGC 1851
• An abundance analysis of bright giants in the globular cluster NGC 1851
• Homogeneous Analysis of Globular Clusters from the APOGEE Survey with the BACCHUS Code. II. The Southern Clusters and Overview
• Exploring Anticorrelations and Light Element Variations in Northern Globular Clusters Observed by the APOGEE Survey
• The Gaia-ESO Survey. Mg-Al anti-correlation in iDR4 globular clusters
• The SUMO project I. A survey of multiple populations in globular clusters
• Stellar Models with Enhanced Abundances of C, N, O, Ne, Na, Mg, Si, S, Ca, and Ti, in Turn, at Constant Helium and Iron Abundances
• Iron and neutron-capture element abundance variations in the globular cluster M2 (NGC 7089)
• Nitrogen abundances in giant stars of the globular cluster NGC 6752
• Deep Mixing in Evolved Stars: I. The Effect of Reaction Rate Revisions from C to Al
• The Bizarre Chemical Inventory of NGC 2419, An Extreme Outer Halo Globular Cluster
• Five groups of red giants with distinct chemical composition in the globular cluster NGC 2808
• Oxygen abundances in low- and high-alpha field halo stars and the discovery of two field stars born in globular clusters
• Na-O Anticorrelation and HB. II. The Na-O anticorrelation in the globular cluster NGC 6752
• GALA: an automatic tool for the abundance analysis of stellar spectra
• A homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code. I. The Northern clusters
• High Precision Differential Abundance Measurements in Globular Clusters: Chemical Inhomogeneities in NGC 6752
• Origin of Abundance Inhomogeneity in Globular Clusters
• Tracing the evolution of NGC6397 through the chemical composition of its stellar populations
• CNO abundances in the globular clusters NGC 1851 and NGC 6752
• Chemical tagging of three distinct populations of red giants in the globular cluster NGC 6752
• Low-resolution spectroscopy of main sequence stars belonging to 12 Galactic globular clusters. I. CH and CN band strength variations
• NGC 362: another globular cluster with a split red giant branch
• Constraining stellar population models - I. Age, metallicity, and abundance pattern compilation for Galactic globular clusters
• Terzan 8: a Sagittarius-flavoured globular cluster
• Calcium and light-elements abundance variations from high resolution spectroscopy in globular clusters
• The extreme chemistry of multiple stellar populations in the metal-poor globular cluster NGC 4833
• Manganese Abundances in Cluster and Field Stars
• Primordial r-process Dispersion in Metal-Poor Globular Clusters
• A chemical trompe-l'œil: no iron spread in the globular cluster M22
• NLTE Chemical abundances in Galactic open and globular clusters
• Atomic diffusion and mixing in old stars IV: Weak abundance trends in the globular cluster NGC 6752
• Rubidium and lead abundances in giant stars of the globular clusters M4 and M5
• Mg isotope ratios in giant stars of the globular clusters M 13 and M 71
• Chemical composition of the old globular clusters NGC 1786, NGC 2210 and NGC 2257 in the Large Magellanic Cloud
• GRACES observations of young [alpha/Fe]-rich stars
• The Gaia-ESO survey: 3D NLTE abundances in the open cluster NGC 2420 suggest atomic diffusion and turbulent mixing at the origin of chemical abundance variations
• The Gaia-ESO Survey: A globular cluster escapee in the Galactic halo
• Multiple populations in Omega Centauri: a cluster analysis of spectroscopic data
• The Chemical Evolution of Globular Clusters I. Reactive Elements and Non-Metals
• An aluminium tool for multiple stellar generations in the globular clusters 47 Tuc and M 4
• Stellar Models of Multiple Populations in Globular Clusters. I. The Main Sequence of NGC 6752
• Rubidium and lead abundances in giant stars of the globular clusters M 13 and NGC 6752
• Towards a working model for the abundance variations within Globular Clusters stars
• Detailed Chemical Abundances in NGC 5824: Another Metal-Poor Globular Cluster with Internal Heavy Element Abundance Variations
• Two Groups of Red Giants with Distinct Chemical Abundances in the Bulge Globular Cluster NGC 6553 Through the Eyes of APOGEE
• Chemical abundances in bright giants of the globular cluster M62 (NGC 6266)
• Three discrete groups with homogeneous chemistry along the red giant branch in the globular cluster NGC 2808
• A Chemical Composition Survey of the Iron-Complex Globular Cluster NGC 6273 (M 19)
• The HST Large Programme on NGC6752. II. Multiple populations at the bottom of the main sequence probed in NIR
• The chemical composition of the low-mass Galactic globular cluster NGC 6362
• The chemical composition of a regular halo globular cluster: NGC 5897
• Observing multiple stellar populations with FORS2@VLT - Main sequence photometry in outer regions of NGC 6752, NGC 6397, and NGC 6121 (M 4)
• All quiet in the outer halo: chemical abundances in the globular cluster Pal 3
• Detailed Abundances of 15 Stars in the Metal-Poor Globular Cluster NGC 4833
• The fraction of first and second generation stars in globular clusters. I The case of NGC 6752
• Multiple Stellar Populations in Globular Clusters with JWST: a NIRCam view of 47 Tucanae
• Globular Cluster Abundances from High-Resolution, Integrated-Light Spectroscopy. II. Expanding the Metallicity Range for Old Clusters and Updated Analysis Techniques
• Non-LTE Sodium Abundance in Galactic Thick- and Thin-Disk Red Giants
• Chemical Abundances for the Outer Halo Cluster Pal 4 from Co-added High-Resolution Spectroscopy
• Chemical Complexity in the Eu-enhanced Monometallic Globular Cluster NGC 5986
• Nucleosynthesis in the Stellar Systems omega Cen and M22
• Survey of multiple populations in globular clusters among very low-mass stars
• On the internal pollution mechanisms in the globular cluster NGC 6121 (M4): heavy-element abundances and AGB models
• Aluminum abundances of multiple stellar generations in the globular cluster NGC 1851
• Light and Heavy Element Abundance Variations in the Outer Halo Globular Cluster NGC 6229
• MgAl burning chain in Omega Centauri
• The Gaia-ESO Survey: Detailed Abundances in the Metal-poor Globular Cluster NGC 4372
• CAPOS: the bulge Cluster APOgee Survey II. The Intriguing "Sequoia" Globular Cluster FSR 1758
• CCD Photometry of the globular cluster NGC 5466. RR Lyrae light curve decomposition and the distance scale
• r-process Abundance Patterns in the Globular Cluster M92
• Excess of Ca (and Sc) produced in globular cluster multiple populations: a first census in 77 Galactic globular clusters
• The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366
• Rubidium abundances in the globular clusters NGC 6752, NGC 1904 and NGC 104 (47 Tuc)
• NGC 1261: an $r$-process enhanced globular cluster from the Gaia-Enceladus event
• Barium abundance in red giants of NGC 6752. Non-local thermodynamic equilibrium and three-dimensional effects
• First evidence of multiple populations along the AGB from Strömgren photometry
• Chemistry of multiple stellar populations in the mono-metallic, in situ, bulge globular cluster NGC 6388
• A chemical signature from fast-rotating low-metallicity massive stars: ROA 276 in omega Centauri
• Cu I resonance lines in turn-off stars of NGC 6752 and NGC 6397. Effects of granulation from CO5BOLD models
• High Resolution Spectroscopic Abundances of Red Giant Branch Stars in NGC 6681
• Gaia-ESO Survey: Detailed elemental abundances in red giants of the peculiar globular cluster NGC 1851
• NGC 6752 AGB Stars Revisited: I. Improved AGB temperatures remove apparent overionisation of Fe I
• Models of Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. I. Bolometric Corrections Derived from New MARCS Synthetic Spectra and Their Implications for Observed Colour-Magnitude Diagrams
• Models for Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. II. Application to the Colour-Magnitude Diagrams of the Globular Clusters 47 Tuc, NGC 6362, M5, M3, M55, and M92
• Stellar-Encounter Driven Red-Giant Star Mass-Loss in Globular Clusters
• The Chemical Evolution of Globular Clusters - II. Metals and Fluorine
• Chemical Abundances of the Typhon Stellar Stream
• CAPOS: The bulge Cluster APOGEE Survey VI. Characterizing multiple stellar populations and chemical abundances in the bulge globular cluster NGC 6569
• APOGEE-2S Mg-Al anti-correlation of the Metal-Poor Globular Cluster NGC 2298
• Chemical Analysis of Five Red Giants in the Globular Cluster M10 (NGC 6254)
• Neutron-capture elements in NGC 6752 multiple populations
• Chemical tagging with APOGEE, MUSE, and HST: constraints on the formation of $\omega$ Centauri
• Synthetic photometry of globular clusters: Uncertainties on synthetic colors
• Homogenous abundances of Mg, Si, Ca, and Ti for about 1500 red giants in 16 globular clusters from FLAMES spectra
• The quite complex "Simple Stellar Populations" of Globular Clusters
• Homogeneous abundance ratios of hydrostatic and explosive alpha-elements in globular clusters from high resolution optical spectroscopy