Carbon, oxygen, and iron abundances in disk and halo stars. Implications of 3D non-LTE spectral line formation

Abstract

The abundances of carbon, oxygen, and iron in late-type stars are important parameters in exoplanetary and stellar physics, as well as key tracers of stellar populations and Galactic chemical evolution. We carried out three-dimensional (3D) non-LTE radiative transfer calculations for CI and OI, and 3D LTE radiative transfer calculations for FeII, across the STAGGER-grid of 3D hydrodynamic model atmospheres. The absolute 3D non-LTE versus 1D LTE abundance corrections can be as severe as $-0.3$ dex for CI lines in low-metallicity F dwarfs, and $-0.6$ dex for OI lines in high-metallicity F dwarfs. The 3D LTE versus 1D LTE abundance corrections for FeII lines are less severe, typically less than $+0.15$ dex. We used the corrections in a re-analysis of carbon, oxygen, and iron in $187$ F and G dwarfs in the Galactic disk and halo. Applying the differential 3D non-LTE corrections to 1D LTE abundances visibly reduces the scatter in the abundance plots. The thick disk and high-$\alpha$ halo population rise in carbon and oxygen with decreasing metallicity, and reach a maximum of [C/Fe]$\approx 0.2$ and a plateau of [O/Fe]$\approx 0.6$ at [Fe/H]$\approx -1.0$. The low-$\alpha$ halo population is qualitatively similar, albeit offset towards lower metallicities and with larger scatter. Nevertheless, these populations overlap in the [C/O] versus [O/H] plane, decreasing to a plateau of [C/O]$\approx -0.6$ below [O/H]$\approx -1.0$. In the thin-disk, stars having confirmed planet detections tend to have higher values of C/O at given [O/H]; this potential signature of planet formation is only apparent after applying the abundance corrections to the 1D LTE results. Our grids of line-by-line abundance corrections are publicly available and can be readily used to improve the accuracy of spectroscopic analyses of late-type stars.

arXiv comment20 pages, 14 figures, 7 online tables; arXiv abstract abridged; published in Astronomy & Astrophysics

References in corpus (112)

• The chemical composition of the Sun
• Gaia Data Release 2. Summary of the contents and survey properties
• Validation of the new Hipparcos reduction
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• 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
• First stars V - Abundance patterns from C to Zn and supernova yields in the early Galaxy
• Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
• The 'Forbidden' Abundance of Oxygen in the Sun
• The Chemical Evolution of the Galaxy: the two-infall model
• Galactic chemical evolution: Carbon through Zinc
• The NASA Exoplanet Archive: Data and Tools for Exoplanet Research
• An absolutely calibrated effective temperature scale from the InfraRed Flux Method
• Nucleosynthesis and Evolution of Massive Metal-Free Stars
• Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
• Abundance Gradients and the Formation of the Milky Way
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• Presupernova evolution and explosive nucleosynthesis of rotating massive stars in the metallicity range -3 <=[Fe/H]<= 0
• Two distinct halo populations in the solar neighborhood. Evidence from stellar abundance ratios and kinematics
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• Carbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars
• Nominal values for selected solar and planetary quantities: IAU 2015 Resolution B3
• Helioseismology and Solar Abundances
• Non-LTE calculations for neutral Na in late-type stars using improved atomic data
• The GALAH Survey: Second Data Release
• In disguise or out of reach: first clues about in-situ and accreted stars in the stellar halo of the Milky Way from Gaia DR2
• NLTE line formation of Fe in late-type stars II: 1D spectroscopic stellar parameters
• The Most Metal-Poor Stars. II. Chemical Abundances of 190 Metal-Poor Stars Including 10 New Stars With [Fe/H] < -3.5
• First Stars VIII -- Enrichment of the neutron-capture elements in the early Galaxy
• The Y^2 Stellar Evolutionary Tracks
• The delay-time distribution of type-Ia supernovae from Sloan II
• Oxygen, Carbon and Nitrogen evolution in galaxies
• The Stagger-grid: A Grid of 3D Stellar Atmosphere Models - I. Methods and General Properties
• Oxygen Abundances in Nearby FGK Stars and the Galactic Chemical Evolution of the Local Disk and Halo
• O/Fe in metal-poor main sequence and subgiant stars
• A strong case for fast stellar rotation at very low metallicities
• Using chemical tagging to redefine the interface of the Galactic disk and halo
• The evolution of the C/O ratio in metal-poor halo stars
• 3D Hydrodynamical Simulations of Surface Convection in Red Giant Stars. Impact on spectral line formation and abundance analysis
• XHIP: An Extended Hipparcos Compilation
• Chemical Clues on the Formation of Planetary Systems: C/O vs Mg/Si for HARPS GTO Sample
• Both accurate and precise gf-values for FeII lines
• Non-LTE line formation of Fe in late-type stars - III. 3D non-LTE analysis of metal-poor stars
• Two distinct halo populations in the solar neighborhood. II. Evidence from stellar abundances of Mn, Cu, Zn, Y, and Ba
• The Chemical Homogeneity of Sun-like Stars in the Solar Neighborhood
• Carbon and Oxygen Abundances in Low Metallicity Dwarf Galaxies
• HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang
• First stars IX -Mixing in extremely metal-poor giants. Variation of the 12C/13C, [Na/Mg] and [Al/Mg] ratios
• Sulphur and zinc abundances in Galactic halo stars revisited
• Kinematics and chemical properties of the Galactic stellar populations. The HARPS FGK dwarfs sample
• APOGEE Data Releases 13 and 14: Stellar Parameter and Abundance Comparisons With Independent Analyses
• Silver and palladium help unveil the nature of a second r-process
• The Chemical Evolution of Carbon, Nitrogen, and Oxygen in Metal-Poor Dwarf Galaxies
• Disentangling the Galactic Halo with APOGEE: I. Chemical and Kinematical Investigation of Distinct Metal-Poor Populations
• 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
• Sulphur and zinc abundances in Galactic stars and damped Lyman-alpha systems
• The Fall of a Giant. Chemical evolution of Enceladus, alias the Gaia Sausage
• Carbon and oxygen abundances in stellar populations
• Non-LTE oxygen line formation in 3D hydrodynamic model stellar atmospheres
• The GALAH survey: An abundance, age, and kinematic inventory of the solar neighbourhood made with TGAS
• Two distinct halo populations in the solar neighborhood. III. Evidence from stellar ages and orbital parameters
• VLT/FLAMES high-resolution chemical abundances in Sculptor: a textbook dwarf spheroidal galaxy
• Accurate abundance analysis of late-type stars: advances in atomic physics
• The chemical compositions of the extreme halo stars HE0107-5240 and HE1327-2326 inferred from 3D hydrodynamical model atmospheres
• On inelastic hydrogen atom collisions in stellar atmospheres
• Carbon Nitrogen, and Oxygen Galactic Gradients: A Solution to the Carbon Enrichment Problem
• High-precision stellar abundances of the elements - methods and applications
• The C/O ratio at low metallicity: constraints on early chemical evolution from observations of Galactic halo stars
• Center-to-Limb Variation of Solar Line Profiles as a Test of NLTE Line Formation Calculations
• C/O Ratios of Stars with Transiting Hot Jupiter Exoplanets
• The photospheric solar oxygen project: IV. 3D-NLTE investigation of the 777 nm triplet lines
• The solar silicon abundance based on 3D non-LTE calculations
• Chemistry in an Evolving Protoplanetary Disk: Effects on Terrestrial Planet Composition
• Heavy metal rules. I. Exoplanet incidence and metallicity
• Planetesimal Compositions in Exoplanet Systems
• 3D NLTE analysis of the most iron-deficient star, SMSS0313-6708
• Non-LTE line formation of Fe in late-type stars IV: Modelling of the solar centre-to-limb variation in 3D
• Excitation and charge transfer in low-energy hydrogen atom collisions with neutral atoms: Theory, comparisons, and application to Ca
• Neutral oxygen spectral line formation revisited with new collisional data: large departures from LTE at low metallicity
• The first carbon-enhanced metal-poor star found in the Sculptor dwarf spheroidal
• Effective temperature determinations of late-type stars based on 3D non-LTE Balmer line formation
• Three Ancient Halo Subgiants: Precise Parallaxes, Compositions, Ages, and Implications for Globular Clusters
• Inelastic O+H collisions and the OI 777nm solar centre-to-limb variation
• High-precision abundances of elements in Kepler LEGACY stars. Verification of trends with stellar age
• Carbon-Enhanced Metal-Poor Stars: CEMP-s and CEMP-no Sub-Classes in the Halo System of the Milky Way
• Carbon in Red Giants in Globular Clusters and Dwarf Spheroidal Galaxies
• The Evolution of Carbon and Oxygen in the Bulge and Disk of the Milky Way
• Granulation properties of giants, dwarfs, and white dwarfs from the CIFIST 3D model atmosphere grid
• The Stagger-grid: A Grid of 3D Stellar Atmosphere Models - II. Horizontal and Temporal Averaging and Spectral Line Formation
• The Galactic chemical evolution of oxygen inferred from 3D non-LTE spectral line formation calculations
• 3D LTE spectral line formation with scattering in red giant stars
• 3D non-LTE line formation of neutral carbon in the Sun
• C/O vs Mg/Si ratios in solar type stars: The HARPS sample
• Carbon and oxygen in metal-poor halo stars
• The non-LTE line formation of neutral carbon in late-type stars
• CNO behaviour in planet-harbouring stars. II. Carbon abundances in stars with and without planets using the CH band
• The benchmark halo giant HD 122563: CNO abundances revisited with three-dimensional hydrodynamic model stellar atmospheres
• The Most Metal-Poor Stars. V. The CEMP-no Stars in 3D and Non-LTE
• From cold to hot irradiated gaseous exoplanets: Toward an observation-based classification scheme
• G64-12 and G64-37 are Carbon-Enhanced Metal-Poor Stars
• Two distinct halo populations in the solar neighborhood. IV. Lithium abundances
• Atomic transition probabilities for UV and blue lines of Fe II and abundance determinations in the photospheres of the Sun and metal-poor star HD 84937
• An in-depth spectroscopic examination of molecular bands from 3D hydrodynamical model atmospheres I. Formation of the G-band in metal-poor dwarf stars
• An in-depth spectroscopic examination of molecular bands from 3D hydrodynamical model atmospheres. II. Carbon-enhanced metal-poor 3D model atmospheres
• Inelastic e+Mg collision data and its impact on modelling stellar and supernova spectra
• Carbon and nitrogen abundances of individual stars in the Sculptor dwarf spheroidal galaxy
• Masses, Oxygen and Carbon abundances in CHEPS dwarf stars
• Excitation and charge transfer in low-energy hydrogen atom collisions with neutral oxygen
• Excitation and charge transfer in low-energy hydrogen atom collisions with neutral carbon and nitrogen
• Carbon-to-Oxygen Ratios in M dwarfs and Solar-type stars
• Ages of 70 dwarfs of three populations in the solar neighborhood: considering O and C abundances in stellar models
• CD -24_17504 revisited: a new comprehensive element abundance analysis

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• A non-interacting Galactic black hole candidate in a binary system with a main-sequence star
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• The NIRVANDELS Survey: a robust detection of $\alpha$-enhancement in star-forming galaxies at $z\simeq 3.4$
• A Clear View of a Cloudy Brown Dwarf Companion from High-Resolution Spectroscopy
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• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program IV. Carbon and C/O ratios for Galactic stellar populations and planet hosts
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• 3D non-LTE iron abundances in FG-type dwarfs
• Evidence for $\gtrsim 4$ Gyr timescales of neutron star mergers from Galactic archaeology
• The evolution of CNO elements in galaxies
• Beyond the two-infall model I. Indications for a recent gas infall with Gaia DR3 chemical abundances
• Fundamental stellar parameters of benchmark stars from CHARA interferometry. I. Metal-poor stars
• Evidence that the Hot Jupiter WASP-77 A b Formed Beyond Its Parent Protoplanetary Disk's H2O Ice Line
• Light Elements in the Universe
• The stellar mass versus stellar metallicity relation of star-forming galaxies at $1.6\le z\le 3.0$ and implications for the evolution of the $\alpha$-enhancement
• Retrieving the C and O Abundances of HR 7672~AB: a Solar-Type Primary Star with a Benchmark Brown Dwarf
• On the variation of carbon abundance in galaxies and its implications
• The chemical composition of globular clusters in the Local Group
• The Gaia-ESO Survey: Carbon abundance in the Galactic thin and thick disks
• Cosmic nucleosynthesis: a multi-messenger challenge
• Tracing Pop III supernovae with extreme energies through the Sculptor dwarf spheroidal galaxy
• Neutron-capture elements in dwarf galaxies II: Challenges for the s- and i-processes at low metallicity
• Measuring Elemental Abundances of JWST Target Stars for Exoplanet Characterization I. FGK Stars
• Evidence of First Stars-enriched Gas in High-redshift Absorbers
• The GAPS Programme at TNG -- XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
• Mono-enriched stars and Galactic chemical evolution -- Possible biases in observations and theory
• On the effects of the Initial Mass Function on Galactic chemical enrichment
• The energy distribution of the first supernovae
• The R-Process Alliance: Fifth Data Release from the Search for R-Process-Enhanced Metal-poor Stars in the Galactic Halo with the GTC
• MINCE I. Presentation of the project and of the first year sample
• Oxygen-enhanced extremely metal-poor DLAs: A signpost of the first stars?
• Non-detection of ${}^6$Li in Spite plateau stars with ESPRESSO
• Influence of Collisions with Hydrogen on Titanium Abundance Determinations in Cool Stars
• The Gaia-ESO Survey: Oxygen abundance in the Galactic thin and thick disks
• CHEMOUT: CHEMical complexity in star-forming regions of the OUTer Galaxy. I. Organic molecules and tracers of star-formation activity
• Testing abundance-age relations beyond solar analogues with Kepler LEGACY stars
• A high-precision abundance analysis of the nuclear benchmark star HD 20
• Sub-damped Lyman alpha systems in the XQ-100 survey II -- Chemical evolution at 2.4<z<4.3
• Fresh view of the hot brown dwarf HD 984 B through high-resolution spectroscopy
• M giants with IGRINS I. Stellar parameters and $\alpha$-abundance trends of the solar neighborhood population
• An extended and refined grid of 3D STAGGER model atmospheres. Processed snapshots for stellar spectroscopy
• VLTI/GRAVITY Observations and Characterization of the Brown Dwarf Companion HD 72946 B
• The peculiar chemical pattern of the WASP-160 binary system: signatures of planetary formation and evolution?
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• The first heavy-metal hot subdwarf composite binary SB 744
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