The chemical DNA of the Magellanic Clouds -- I. The chemical composition of 206 Small Magellanic Cloud red giant stars

Abstract

We present the chemical composition of 206 red giant branch stars members of the Small Magellanic Cloud (SMC) using optical, high-resolution spectra collected with the multi-object spectrograph FLAMES-GIRAFFE at the ESO Very Large Telescope. This sample includes stars in three fields located in different positions within the parent galaxy. We analysed the main groups of elements, namely light- (Na), alpha- (O, Mg, Si, Ca, Ti), iron-peak (Sc, V, Fe, Ni, Cu) and s-process elements (Zr, Ba, La). The metallicity distribution of the sample displays a main peak around [Fe/H] ~ -1 dex and a weak metal-poor tail. However, the three fields display [Fe/H] distributions different with each other, in particular a difference of 0.2 dex is found between the mean metallicities of the two most internal fields.The fraction of metal-poor stars increases significantly (from ~1 to ~20%) from the innermost fields to the most external one, likely reflecting an age gradient in the SMC. Also, we found a hint of possible chemically/kinematic distinct substructures. The SMC stars have abundance ratios clearly distinct with respect to the Milky Way stars, in particular for the elements produced by massive stars (like Na, $\alpha$ and most iron-peak elements) that have abundance ratios systematically lower than those measured in our Galaxy. This points out that the massive stars contributed less to the chemical enrichment of the SMC with respect to the Milky Way, according to the low star formation rate expected for this galaxy. Finally, we identified small systematic differences in the abundances of some elements (Na, Ti, V and Zr) in the two innermost fields, suggesting that the chemical enrichment history in the SMC has been not uniform.

arXiv comment16 pages, 11 figures, 5 tables. Accepted for publication in Astronomy and Astrophysics

References in corpus (86)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Gaia mission
• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
• A Universal Stellar Initial Mass Function? A Critical Look at Variations
• Elemental Abundance Survey of The Galactic Thick Disk
• Solar Chemical Abundances Determined with a CO5BOLD 3D Model Atmosphere
• Na-O Anticorrelation and HB. VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra
• The Chemical Compositions of Galactic Disk F and G Dwarfs
• Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
• alpha-, r-, and s-process element trends in the Galactic thin and thick disks
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-Poor Giants
• The Hamburg/ESO R-process Enhanced Star survey (HERES) II. Spectroscopic analysis of the survey sample
• Abundances and Kinematics of Field Halo and Disk Stars I: Observational Data and Abundance Analysis
• A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars
• Gaia Data Release 2: first stellar parameters from Apsis
• Third-Epoch Magellanic Cloud Proper Motions I: HST/WFC3 data and Orbit Implications
• The Star Formation History of the Small Magellanic Cloud
• Quantifying the uncertainties of chemical evolution studies. II. Stellar yields
• Non-LTE calculations for neutral Na in late-type stars using improved atomic data
• Abundances for metal-poor stars with accurate parallaxes I. Basic 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 Look at the Kinematics of Neutral Hydrogen in the Small Magellanic Cloud
• Evolution, Explosion and Nucleosynthesis of Core Collapse Supernovae
• DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
• Simulations of the Magellanic Stream in a First Infall Scenario
• The exotic chemical composition of the Sagittarius dwarf Spheroidal galaxy
• The Araucaria Project. The distance to the Small Magellanic Cloud from late-type eclipsing binaries
• Chemical Evolution of the Magellanic Clouds: analytical models
• The influence of chemical composition on the properties of Cepheid stars. II-The iron content
• The impact of the metallicity and star formation rate on the time-dependent galaxy-wide stellar initial mass function
• TAPAS, a web-based service of atmospheric transmission computation for astronomy
• The evolution of CNO isotopes: a new window on cosmic star-formation history and the stellar IMF in the age of ALMA
• Spectroscopic Survey of Red Giants in the SMC. I: Kinematics
• Formation and evolution of the Magellanic Clouds. I.Origin of structural, kinematical, and chemical properties of the Large Magellanic Cloud
• APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites
• Chemical abundances in LMC stellar populations I. The Inner disk sample Based on observations collected at the VLT UT2 telescope
• The origin and evolution of r- and s-process elements in the Milky Way stellar disk
• Explosive Nucleosynthesis in Near-Chandrasekhar Mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters
• Clustering of Local Group distances: publication bias or correlated measurements? III. The Small Magellanic Cloud
• The Chemical Enrichment History of the Small Magellanic Cloud and Its Gradients
• Chemical abundances in LMC stellar populations. II. The bar sample
• The Dawes Review 8: Measuring the Stellar Initial Mass Function
• New Type Ia supernova Yields and the Manganese and Nickel Problems in the Milky Way and Dwarf Spheroidal Galaxies
• Depth estimation of the Large and Small Magellanic Clouds
• The VMC Survey. XXV. The 3D structure of the Small Magellanic Cloud from Classical Cepheids
• The Lazy Giants: APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds
• VLT/FLAMES high-resolution chemical abundances in Sculptor: a textbook dwarf spheroidal galaxy
• The VMC survey - XXXI. The spatially resolved star formation history of the main body of the Small Magellanic Cloud
• Exploiting the Gaia EDR3 photometry to derive stellar temperatures
• Abundances of neutron-capture elements in stars of the galactic disk substructures
• GALA: an automatic tool for the abundance analysis of stellar spectra
• Explaining the mysterious age gap of globular clusters in the Large Magellanic Cloud
• Multiple populations in the old and massive Small Magellanic Cloud globular cluster NGC121
• The Evolution of Copper in the Globular Cluster Omega Centauri
• The extreme chemistry of multiple stellar populations in the metal-poor globular cluster NGC 4833
• Mean age gradient and asymmetry in the star formation history of the Small Magellanic Cloud
• Cu and Zn in the early Galaxy
• The synchronised dance of the Magellanic Clouds' star formation history
• Revealing the tidal scars of the Small Magellanic Cloud
• Red Giants in the Small Magellanic Cloud. II. Metallicity Gradient and Age-Metallicity Relation
• Red Giants in the Small Magellanic Cloud. I. Disk and Tidal Stream Kinematics
• Chemical composition of the old globular clusters NGC 1786, NGC 2210 and NGC 2257 in the Large Magellanic Cloud
• Nucleosynthesis imprints from different Type Ia Supernova explosion scenarios and implications for galactic chemical evolution
• On the dynamics of the Small Magellanic Cloud through high-resolution ASKAP HI observations
• Old Main-Sequence Turnoff Photometry in the Small Magellanic Cloud. I. Constraints on the Star Formation History in Different Fields
• Contrasting copper evolution in Omega Centauri and the Milky Way
• Facing the problems on the determination of stellar temperatures and gravities: Galactic globular clusters
• Chemical evolution of ultra-faint dwarf galaxies in the self-consistently calculated IGIMF theory
• The stellar metallicity gradients of Local Group dwarf galaxies
• Star Formation History in two fields of the Small Magellanic Cloud Bar
• Chemical Signature of a Major Merger in the Early Formation of Small Magellanic Cloud
• Magellanic Mayhem: Metallicities and Motions
• Tagging the Chemical Evolution History of the Large Magellanic Cloud Disk
• Non-LTE analysis of neutral copper in the late-type metal-poor stars
• A bottom-heavy initial mass function for the likely-accreted blue-halo stars of the Milky Way
• Kinematical Structure of the Magellanic System
• The VMC survey -- XXXIX: Mapping metallicity trends in the Small Magellanic Cloud using near-infrared passbands
• Ca II Triplet Spectroscopy of Small Magellanic Cloud Red Giants. V. Abundances and Velocities for 12 Massive Clusters
• A homogeneous comparison between the chemical composition of the Large Magellanic Cloud and the Sagittarius dwarf galaxy
• The chemical composition of the stellar cluster Gaia1: no surprise behind Sirius
• Near-Infrared Photometry of Four Stellar Clusters in the Small Magellanic Cloud

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• The VISCACHA survey -- VIII. Chemical evolution history of Small Magellanic Cloud West Halo cluster
• Extragalactic 85Rb/87Rb and 6Li/7Li ratios in the Small Magellanic Cloud
• s-process Enriched Evolved Binaries in the Galaxy and the Magellanic Clouds
• s-process Enriched Post-AGB Star J003643.94-723722.1 in the SMC with an Extreme C/O Ratio and the First Precise Detection of Lead
• The Small Magellanic Cloud through the lens of the James Webb Space Telescope : binaries and mass function within the galaxy outskirts
• A chemical close-up of the main body of the Sagittarius dwarf galaxy
• The chemical DNA of the Magellanic Clouds V. R-process dominates neutron capture elements production in the oldest SMC stars
• The accreted Galaxy: An overview of TESS metal-poor accreted stars candidates
• Neutron-capture elements in a sample of field metal-poor N-rich dwarfs
• Gaia-Sausage-Enceladus: Lithium evolution from early red-giant-branch and main-sequence stars
• The chemical DNA of the Magellanic Clouds VI. Origin and evolution of neutron-capture elements in the SMC