High-resolution Spectroscopic Study of Dwarf Stars in the Northern Sky: Lithium, Carbon, and Oxygen Abundances

Abstract

Abundances of lithium, carbon, and oxygen have been derived using spectral synthesis for a sample of 249 bright F, G, and K Northern Hemisphere dwarf stars from the high-resolution spectra acquired with the VUES spectrograph at the Moletai Astronomical Observatory of Vilnius University. The sample stars have metallicities, effective temperatures, and ages between -0.7 and 0.4 dex; 5000 and 6900 K; 1 and 12 Gyr, accordingly. We confirm a so far unexplained lithium abundance decrease at supersolar metallicities - $A$(Li) in our sample stars, which drop by 0.7 dex in the [Fe/H] range from +0.10 to +0.55 dex. Furthermore, we identified stars with similar ages, atmospheric parameters, and rotational velocities, but with significantly different lithium abundances, which suggests that additional specific evolutionary factors should be taken into account while interpreting the stellar lithium content. Nine stars with predominantly supersolar metallicities, i.e. about 12 % among 78 stars with C and O abundances determined, have the C/O number ratios larger than 0.65, thus may form carbon-rich rocky planets. Ten planet-hosting stars, available in our sample, do not show a discernible difference from the stars with no planets detected regarding their lithium content.

arXiv comment17 pages, 15 figures. Published 2020 February 6, 2020. The Astronomical Journal

References in corpus (65)

• The Transiting Exoplanet Survey Satellite
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• The PLATO 2.0 Mission
• Elemental Abundance Survey of The Galactic Thick Disk
• The NASA Exoplanet Archive: Data and Tools for Exoplanet Research
• An absolutely calibrated effective temperature scale from the InfraRed Flux Method
• Chromospheric Activity and Jitter Measurements for 2630 Stars on the California Planet Search
• Spectral Properties of Cool Stars: Extended Abundance Analysis of 1617 Planet Search Stars
• A Bitter Pill: The Primordial Lithium Problem Worsens
• Departures from LTE for neutral Li in late-type stars
• The Compositional Diversity of Extrasolar Terrestrial Planets: I. In-Situ Simulations
• Towards Chemical Constraints on Hot Jupiter Migration
• Lithium abundances in nearby FGK dwarf and subgiant stars: internal destruction, Galactic chemical evolution, and exoplanets
• Exoplanetary Atmospheres - Chemistry, Formation Conditions, and Habitability
• Enhanced lithium depletion in Sun-like stars with orbiting planets
• Chemical Clues on the Formation of Planetary Systems: C/O vs Mg/Si for HARPS GTO Sample
• The Chemical Homogeneity of Sun-like Stars in the Solar Neighborhood
• Production and evolution of Li, Be and B isotopes in the Galaxy
• Experimental f-value and isotopic structure for the Ni I line blended with [OI] at 6300A
• Lithium in stars with exoplanets
• Li abundances in F stars: planets, rotation and galactic evolution
• Abundances in the Local Region II: F, G and K Dwarfs and Subgiants
• The origin and chemical evolution of carbon in the Galactic thin and thick disks
• Searching for the signatures of terrestial planets in solar analogs
• Carbon and oxygen abundances in stellar populations
• Lithium Abundances of the Local Thin Disk Stars
• Elemental ratios in stars vs planets
• Li depletion in solar analogues with exoplanets: Extending the sample
• High-precision stellar abundances of the elements - methods and applications
• Metal-rich accretion and thermohaline instabilities in exoplanets-host stars: consequences on the light elements abundances
• Abundances of Stars with Planets: Trends with Condensation Temperature
• Cepheid Abundances: Multiphase Results and Spatial Gradients
• Silicon and Oxygen Abundances in Planet-Host Stars
• Chemistry in an Evolving Protoplanetary Disk: Effects on Terrestrial Planet Composition
• The solar photospheric abundance of carbon.Analysis of atomic carbon lines with the CO5BOLD solar model
• Carbon and Oxygen in Nearby Stars: Keys to Protoplanetary Disk Chemistry
• Gas composition of main volatile elements in protoplanetary discs and its implication for planet formation
• Homogeneous abundance analysis of dwarf, subgiant and giant FGK stars with and without giant planets
• A Comparative Study on Lithium Abundances in Solar--Type Stars With and Without Planets
• The stellar origin of 7Li - Do AGB stars contribute a substantial fraction of the local Galactic lithium abundance?
• Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert
• The Evolution of Carbon and Oxygen in the Bulge and Disk of the Milky Way
• C/O and O/H Ratios Suggest Some Hot Jupiters Originate Beyond the Snow Line
• Planet signatures and effect of the chemical evolution of the Galactic thin-disk stars
• The AMBRE Project: Constraining the lithium evolution in the Milky Way
• The Role of Ice Compositions for Snowlines and the C/N/O Ratios in Active Disks
• Activity and the Li abundances in the FGK dwarfs
• The Li-age correlation: the Sun is unusually Li deficient for its age
• Exploring the production and depletion of lithium in the Milky Way stellar disk
• C/O vs Mg/Si ratios in solar type stars: The HARPS sample
• CNO behaviour in planet-harbouring stars. II. Carbon abundances in stars with and without planets using the CH band
• ${}^7$Li evolution in the thin and thick disks of the Milky Way
• The Gaia -ESO Survey: Lithium enrichment histories of the Galactic thick and thin disc
• The Hercules-Lyra Association revisited New age estimation and multiplicity study
• The AMBRE project: a study of Li evolution in the Galactic thin and thick discs
• Explaining the decrease in ISM lithium at super-solar metallicities in the solar vicinity
• Behaviour of elements from lithium to europium in stars with and without planets
• Exoplanet hosts reveal lithium depletion: Results from a homogeneous statistical analysis
• Masses, Oxygen and Carbon abundances in CHEPS dwarf stars
• The AMBRE Project: searching for the closest solar siblings
• Spectroscopy of Dwarf Stars Around the North Celestial Pole
• Lithium abundance in a sample of solar-like stars
• A detailed study of Lithium in 107 CHEPS dwarf stars
• High-resolution spectroscopic study of dwarf stars in the northern sky: Na to Zn abundances in two fields with radii of 20 degrees

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• High-precision abundances of elements in solar-type stars. Evidence of two distinct sequences in abundance-age relations
• The GALAH Survey: Non-LTE departure coefficients for large spectroscopic surveys
• Cloud busting: enstatite and quartz clouds in the atmosphere of 2M2224-0158
• 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
• Light Elements in the Universe
• The Gaia-ESO Survey: Galactic evolution of lithium at high metallicity
• Extended theoretical transition data in C I - IV
• Chemical Composition Of Bright Stars In The Northern Hemisphere: Star-Planet Connection
• The Gaia-ESO Survey: Oxygen abundance in the Galactic thin and thick disks
• Chemical Composition of Bright Stars in the Continuous Viewing Zone of the TESS Space Mission
• The Lithium Abundances from the Large Sky Area Multi-object Fiber Spectroscopic Telescope Medium-resolution Survey. I. The Method
• WIYN Open Cluster Study LXXXV. Li in NGC 2243 -- Implications for Stellar and Galactic Evolution
• The behaviour of lithium at high metallicity in the Milky Way -- Selection effects in the samples and the possible role of atomic diffusion
• Eta-Earth Revisited II: Deriving a Maximum Number of Earth-like Habitats in the Galactic Disk
• Oxidation of the Interiors of Carbide Exoplanets
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. VIII. Carbon and oxygen
• Chemical composition of stars with massive planets
• Chemical composition of planetary hosts: C, N, and $\alpha$-element abundances
• The role of radial migration on tracing lithium evolution in the Galactic disk
• Proto-planetary disk composition-dependent element volatility in the context of rocky planet formation
• Calibrating the metallicity of M dwarfs in wide physical binaries with F-, G-, and K-primaries -- II: Carbon, oxygen, and odd-Z iron-peak abundances of the primary stars
• Chemical composition of planetary hosts: II. Abundances of neutron-capture elements
• A method to derive self-consistent NLTE astrophysical parameters for 4 million high-resolution 4MOST stellar spectra in half a day with invertible neural networks