Nitrogen abundances in giant stars of the globular cluster NGC 6752

Abstract

We present N abundances for 21 bright giants in the globular cluster NGC 6752 based on high-resolution UVES spectra of the 3360A NH lines. We confirm that the Stromgren c1 index traces the N abundance and find that the star-to-star N abundance variation is 1.95 dex, at the sample's luminosity. We find statistically significant correlations, but small amplitude variations, between the abundances of N and alpha-, Fe-peak, and s-process elements. Analyses using model atmospheres with appropriate N, O, Na, and Al abundances would strengthen, rather than mute, these correlations. If the small variations of heavy elements are real, then the synthesis of the N anomalies must take place in stars which also synthesize alpha-, Fe-peak, and s-process elements. These correlations offer support for contributions from both AGB and massive stars to the globular cluster abundance anomalies.

arXiv commentAccepted for publication in ApJ

References in corpus (27)

• Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
• The O-Na and Mg-Al Anticorrelations in Turn-Off and early Subgiants in Globular Clusters
• Nucleosynthesis and mixing on the Asymptotic Giant Branch. III. Predicted and observed s-process abundances
• Explosive yields of massive stars from Z=0 to Z=Zsun
• Abundances of Baade's Window Giants from Keck/HIRES Spectra: II. The Alpha- and Light Odd Elements
• The early evolution of Globular Clusters: the case of NGC 2808
• On the self-enrichment scenario of galactic globular clusters: Constraints on the IMF
• 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
• The Chemical Composition Contrast between M3 and M13 Revisited: New Abundances for 28 Giant Stars in M3
• Abundances of C, N, O in slightly evolved stars in the globular clusters NGC 6397, NGC 6752 and 47 Tuc
• Abundances in giant stars of the globular cluster NGC 6752
• Mg isotopic ratios in giant stars of the globular cluster NGC 6752
• VLT/UVES Spectroscopy of Individual Stars in Three Globular Clusters in the Fornax Dwarf Spheroidal Galaxy
• Modelling self-pollution of globular clusters from AGB stars
• Chemical Compositions of Red Giant Stars in Old Large Magellanic Cloud Globular Clusters
• C and N Abundances in Stars At the Base of the Red Giant Branch in M5
• Fluorine Abundance Variations in Red Giants of the Globular Cluster M4 and Early-Cluster Chemical Pollution
• A Search for Nitrogen-Enhanced Metal-Poor Stars
• On the C and N Abundances of 47 Tucanae Main Sequence Stars
• C and N Abundances in Stars At the Base of the Red Giant Branch in M15
• On the primordial scenario for abundance variations within globular clusters. The isochrone test
• The Chemical Evolution of Helium in Globular Clusters: Implications for the Self-Pollution Scenario
• Carbon Abundances of Faint Stars in M13 - Evidence for Two Abundance Altering Mechanisms
• Na-O Anticorrelation and HB. IV. Detection of He-rich and He-poor stellar populations in the globular cluster NGC 6218
• Towards a working model for the abundance variations within Globular Clusters stars
• Calibration of the CH and CN Variations Among Main Sequence Stars in M71 and in M13

Cited by in corpus (107)

• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• 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
• 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
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• Synthetic Stellar Photometry - I. General considerations and new transformations for broad-band systems
• What is a globular cluster? An observational perspective
• Multiple stellar populations in 47 Tucanae
• Photometric signatures of multiple stellar populations in Galactic globular clusters
• Origin of multiple stellar populations in globular clusters and their helium enrichment
• A WFC3/HST view of the three stellar populations in the Globular Cluster NGC6752
• Multiple stellar populations in the globular cluster NGC 1851
• Iron and s-elements abundance variations in NGC5286: comparison with anomalous globular clusters and Milky Way satellites
• On the Formation of Multiple Stellar Populations in Globular Clusters
• Hubble Space Telescope reveals multiple Sub-Giant Branch in eight Globular Clusters
• Helium enhanced stars and multiple populations along the horizontal branch of NGC2808: direct spectroscopic measurements
• Looking outside the Galaxy: the discovery of chemical anomalies in 3 old Large Magellanic Cloud clusters
• The SUMO project I. A survey of multiple populations in globular clusters
• Mining SDSS in search of Multiple Populations in Globular Clusters
• A large C+N+O abundance spread in giant stars of the globular cluster NGC 1851
• Abundances for a large sample of red giants in NGC 1851: hints for a merger of two clusters?
• Stroemgren survey for Asteroseismology and Galactic Archaeology: let the SAGA begin
• The Pisa Stellar Evolution Data Base for low-mass stars
• Multiple stellar populations in the Galactic globular cluster NGC 6752
• Global and non-global parameters of horizontal branch morphology of globular clusters
• The Helium content of Globular Clusters: light element abundance correlations and HB morphology. I. NGC6752
• A Double Main Sequence in the Globular Cluster NGC 6397
• The C+N+O abundances and the splitting of the subgiant branch in the Globular Cluster NGC 1851
• High Precision Differential Abundance Measurements in Globular Clusters: Chemical Inhomogeneities in NGC 6752
• Gaia Data Release 3: The Galaxy in your preferred colours. Synthetic photometry from Gaia low-resolution spectra
• Tracing the evolution of NGC6397 through the chemical composition of its stellar populations
• Multiple stellar populations in Magellanic Cloud clusters. III. The first evidence of an extended main sequence turn-off in a young cluster: NGC1856
• CNO abundances in the globular clusters NGC 1851 and NGC 6752
• The double sub-giant branch of NGC 6656 (M22): a chemical characterization
• Nitrogen abundances and multiple stellar populations in the globular clusters of the Fornax dSph
• Chemical tagging of three distinct populations of red giants in the globular cluster NGC 6752
• Sodium content as a predictor of the advanced evolution of globular cluster stars
• Luminosity and mass functions of the three main sequences of the globular cluster NGC 2808
• Calcium and light-elements abundance variations from high resolution spectroscopy in globular clusters
• Constraining stellar population models - I. Age, metallicity, and abundance pattern compilation for Galactic globular clusters
• Stellar Population Models and Individual Element Abundances II: Stellar Spectra and Integrated Light Models
• The infrared eye of the Wide-Field Camera 3 on the Hubble Space Telescope reveals multiple main sequences of very low-mass stars in NGC 2808
• On The Birth Masses of the Ancient Globular Clusters
• A deep insight into the Mg-Al nucleosynthesis in massive AGBs and SAGB stars
• Chemical abundances in giants stars of the tidally disrupted globular cluster NGC 6712 from high-resolution infrared spectroscopy
• Revisiting nucleosynthesis in globular clusters: the case of NGC 2808 and the role of He and K
• Radial distributions of sub-populations in the globular cluster M15: a more centrally concentrated primordial population
• Helium in first and second-generation stars in Globular Clusters from spectroscopy of red giants
• The Relationship Between Globular Cluster Mass, Metallicity, and Light Element Abundance Variations
• Atomic Diffusion and Mixing in Old Stars V: A deeper look into the Globular Cluster NGC 6752
• The chemical composition of red giants in 47 Tucanae I: Fundamental parameters and chemical abundance patterns
• 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
• A Stromgren view of the multiple populations in globular clusters
• Multiple Stellar Populations of Globular Clusters from Homogenous Ca by Photometry I. M22 (NGC 6656)
• Two Groups of Red Giants with Distinct Chemical Abundances in the Bulge Globular Cluster NGC 6553 Through the Eyes of APOGEE
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XII. The RGB Bumps of multiple stellar populations
• Chemical abundances in the multiple sub-giant branch of 47 Tucanae: insights on its faint sub-giant branch component
• Four stellar populations and extreme helium variation in the massive outer-halo globular cluster NGC 2419
• Multiple stellar populations of globular clusters from homogeneous Ca-Cn photometry. II. M5 (NGC 5904) and a new filter system
• Chemical abundances along the 1G sequence of the chromosome maps: The Globular Cluster NGC 3201
• Multiple stellar populations in the globular cluster M3 (NGC 5272): a Strömgren perspective
• On the radial distribution of stars of different stellar generations in the globular cluster NGC 3201
• The fraction of first and second generation stars in globular clusters. I The case of NGC 6752
• Multiple stellar populations in Magellanic Cloud clusters. II. Evidence also in the young NGC1844?
• uvby-$\beta$ photometry of solar twins: the solar colors, model atmospheres, and the Teff and metallicity scales
• Multiple Stellar Populations in Globular Clusters with JWST: a NIRCam view of 47 Tucanae
• Evidence for multiple populations in the massive globular cluster NGC 2419 from deep uVI LBT photometry
• Multiple populations in massive star clusters under the magnifying glass of photometry: Theory and tools
• Ruprecht 106: A riddle, wrapped in a mystery, inside an enigma
• Detailed abundances from integrated-light spectroscopy: Milky Way globular clusters
• Constraints on the Formation of the Globular Cluster IC 4499 from Multi-Wavelength Photometry
• Multiple Stellar Populations in Metal-Poor Globular Clusters with JWST: a NIRCam view of M92
• Confirmation of a metallicity spread amongst first population stars in globular clusters
• Multiple populations along the asymptotic giant branch of the globular cluster M 4
• Multiple stellar populations of globular clusters from homogeneous Ca--CN photometry. III. NGC 6752
• Multiple stellar populations of globular clusters from homogeneous Ca--CN photometry. IV. Toward precision populational tagging
• Are there any first-generation stars in globular clusters today?
• Binary interactions as a possible scenario for the formation of multiple stellar populations in globular clusters
• M13 multiple stellar populations seen with the eyes of Strömgren photometry
• Photometric characterization of multiple populations in star clusters: The impact of the first dredge-up
• A chromosome map to unveil stellar populations with different magnesium abundances. The case of Omega Centauri
• First evidence of multiple populations along the AGB from Strömgren photometry
• Hot horizontal branch stars in NGC 288 - effects of diffusion and stratification on their atmospheric parameters
• When does the onset of multiple stellar populations in star clusters occur-III: No evidence of significant chemical variations in main-sequence stars of NGC 419
• An investigation of C, N and Na abundances in red giant stars of the Sculptor dwarf spheroidal galaxy
• Strömgren uvby photometry of the peculiar globular cluster NGC 2419
• Multiple Stellar Populations of Globular Clusters from Homogeneous Ca-CN-CH-NH Photometry. VI. M3 (NGC 5272) is not a Prototypical Normal Globular Cluster
• Multiple stellar populations at less evolved stages: detection of chemical variations among main-sequence dwarfs in NGC 1978
• Hubble Space Telescope photometry of multiple stellar populations in the inner parts of NGC 2419
• Detection of multiple stellar populations in extragalactic massive clusters with JWST
• The Chemical Evolution of Globular Clusters - II. Metals and Fluorine
• Carbon-enhanced metal-poor stars in the SDSS-APOGEE database
• Photometric Detection of Multiple Populations in Globular Clusters Using Integrated Light
• Apparent Trend of the Iron Abundance in NGC 3201: the Same Outcome with Different Data
• Photometric Metallicities in Bootes I
• Globular clusters as laboratories for stellar evolution
• Role of host galaxy in the formation of multiple stellar populations: Analysis of NGC 1786 and NGC 1898
• Exploring Multiple Stellar Populations in Globular Clusters with Euclid: A Theoretical Overview and Insights from NGC 6397
• Re-examining the Radial Distributions of M13 Multiple Populations
• A Careful Reassessment of Globular Cluster Multiple Population Radial Distributions with Sloan Digital Sky Survey and Johnson-Cousins Broadband Photometry
• Thirteen facts that you need to know on multiple populations in globular clusters
• Synthetic photometry of globular clusters: Uncertainties on synthetic colors
• Photometric stellar parameters for asteroseismology and Galactic studies
• Multiple populations in the Sagittarius nuclear cluster M54 and in other anomalous globular clusters