Chemical characterisation of the X-shooter Spectral Library (XSL): [Mg/Fe] and [Ca/Fe] abundances

Abstract

The X-shooter Spectral Library (XSL) is a large empirical stellar library used as a benchmark for the development of stellar population models. The inclusion of $\alpha$-elements abundances is crucial to disentangling the chemical evolution of any stellar system. The aim of this paper is to provide a catalogue of high-precision and accurate magnesium and calcium abundances from a wide variety of stars well distributed in the Hertzsprung-Russell (HR) diagram. We originally performed an analysis of the derived Mg and Ca abundances for medium-resolution spectra of 611 stars from the XSL Data Release 2. For this purpose, we used the GAUGUIN automated abundance estimation code to fit the ultraviolet-blue (UVB) and visible (VIS) spectra. We tested the consistency of the atmospheric parameters and chemical abundances with the Gaia DR3 and the AMBRE Project datasets. We have finally obtained precise [Mg/Fe] and [Ca/Fe] abundances for 192 and 217 stars respectively, from which 174 stars have measurements in both elements. The stars cover a broad range of effective temperature 4000 < T${}_{\mathrm{eff}}$ < 6500K, surface gravity 0.3 < log(g) < 4.8 cm s${}^{-2}$, and metallicity -2.5 < [Fe/H] < +0.4 dex. We find an excellent agreement with the abundance estimates from the AMBRE:HARPS and the Gaia/RVS (Radial Velocity Spectrometer) analysis. Moreover, the resulting abundances reproduce a plateau in the metal-poor regime followed by a decreasing trend even at supersolar metallicities, as predicted by Galactic chemical evolution models. This catalogue is suitable for improving the modelling of evolutionary stellar population models with empirical $\alpha$-enhancements, which could significantly contribute to the analysis of external galaxies abundances in the near future.

arXiv commentAccepted for publication in A&A

References in corpus (79)

• Stellar population synthesis at the resolution of 2003
• Gaia Data Release 2. Summary of the contents and survey properties
• Gaia Data Release 3: Summary of the content and survey properties
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• MILES: A Medium resolution INT Library of Empirical Spectra
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• The New Galaxy: Signatures of its Formation
• Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
• Modeling the Panchromatic Spectral Energy Distributions of Galaxies
• The Chemical Evolution of the Galaxy: the two-infall model
• Galactic chemical evolution: Carbon through Zinc
• Stellar population models of Lick indices with variable element abundance ratios
• An updated MILES stellar library and stellar population models
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets
• UV-extended E-MILES stellar population models: young components in massive early-type galaxies
• A database of high and medium-resolution stellar spectra
• ULySS: A Full Spectrum Fitting Package
• Quantifying the uncertainties of chemical evolution studies. II. Stellar yields
• Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
• A faint type of supernova from a white dwarf with a helium-rich companion
• Population Synthesis in the Blue IV: Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations
• Empirical calibration of the near-IR Ca II triplet - I. The stellar library and index definition
• Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters
• The evolution of the Milky Way from its earliest phases : constraints on stellar nucleosynthesis
• The PASTEL catalogue of stellar parameters
• Gaia Data Release 3: Analysis of RVS spectra using the General Stellar Parametriser from spectroscopy
• The Gaia-ESO Survey: the Galactic Thick to Thin Disc transition
• Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
• The PASTEL catalogue: 2016 version
• Chemodynamics of the Milky Way. I. The first year of APOGEE data
• A new chemo-evolutionary population synthesis model for early-type galaxies. II: Observations and Results
• The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk
• Flux-calibrated stellar population models of Lick absorption-line indices with variable element abundance ratios
• Atomic data for the Gaia-ESO Survey
• Accuracy and precision of industrial stellar abundances
• The atmospheric parameters and spectral interpolator for the stars of MILES
• Metal-rich, Metal-poor: Updated Stellar Population Models for Old Stellar Systems
• Near-IR line-strengths in elliptical galaxies: evidence for IMF variations?
• Systematic non-LTE study of the $-2.6\le$ [Fe/H] $\le 0.2$ F and G dwarfs in the solar neighbourhood. II. Abundance patterns from Li to Eu
• Automated derivation of stellar atmospheric parameters and chemical abundances: the MATISSE algorithm
• PopStar I: Evolutionary synthesis models description
• The AMBRE project: A new synthetic grid of high-resolution FGKM stellar spectra
• Atomic and Molecular Data for Optical Stellar Spectroscopy
• The GALAH survey: An abundance, age, and kinematic inventory of the solar neighbourhood made with TGAS
• The Zwicky Transient Facility Census of the Local Universe I: Systematic search for Calcium rich gap transients reveal three related spectroscopic sub-classes
• High-precision stellar abundances of the elements - methods and applications
• The X-shooter Spectral Library (XSL): I. DR1. Near-ultraviolet through optical spectra from the first year of the survey
• Stellar population models in the UV: I. Characterisation of the New Generation Stellar Library
• Stellar parametrization from Gaia RVS spectra
• Empirical calibration of the near-IR Ca II triplet - III. Fitting functions
• Stellar population models based on the SDSS-IV MaStar library of stellar spectra. I. Intermediate-age/old models
• Identifying the best iron-peak and $\alpha$-capture elements for chemical tagging: The impact of the number of lines on measured scatter
• Galactic Archaeology with asteroseismic ages. II. Confirmation of a delayed gas infall using Bayesian analysis based on MCMC methods
• The X-Shooter Spectral Library (XSL): Data Release 2
• The AMBRE Project: Stellar parameterisation of the ESO:FEROS archived spectra
• APOGEE DR14/DR15 Abundances in the Inner Milky Way
• Chemical evolution of the Milky Way: constraints on the formation of the thick and thin discs
• The AMBRE Project: Constraining the lithium evolution in the Milky Way
• Gaia Data Release 3: Chemical cartography of the Milky Way
• Stellar atmospheric parameters for 754 spectra from the X-shooter Spectral Library
• Element abundances in the stars of the MILES spectral library: the Mg/Fe ratio
• New atmospheric parameters and spectral interpolator for the MILES cool stars
• The AMBRE project: Iron-peak elements in the solar neighbourhood
• Modelling simple stellar populations in the near-ultraviolet to near-infrared with the X-shooter Spectral Library (XSL)
• NLTE line formation for Mg\ione\ and Mg\ii\ in atmospheres of B-A-F-G-K stars
• Experimental Mg I oscillator strengths and radiative lifetimes for astrophysical applications on metal-poor stars - New data for the Mg I b triplet
• PopStar Evolutionary Synthesis Models II: Optical emission-line spectra from Giant H{\sc ii} regions
• Non-local thermodynamic equilibrium stellar spectroscopy with 1D and 3D models - II. Chemical properties of the Galactic metal-poor disc and the halo
• The AMBRE Project: Parameterisation of FGK-type stars from the ESO:HARPS archived spectra
• The AMBRE Project: Stellar Parameterisation of the ESO:UVES archived spectra
• Early-type galaxies in the Coma cluster: a new piece in the calcium puzzle
• The AMBRE Project: Origin and evolution of sulfur in the Milky Way
• sMILES: A Library of Semi-Empirical MILES Stellar Spectra with Variable [$\alpha$/Fe] Abundances
• The AMBRE Project: Spectrum normalisation influence on Mg abundances in the metal-rich Galactic disc
• GSP-spec line list for the parametrisation of Gaia -RVS stellar spectra
• The AMBRE Project: Solar neighbourhood chemodynamical constraints on Galactic disc evolution
• High-resolution MEGARA IFU spectroscopy and structural analysis of a fast-rotating, disky bulge in NGC 7025
• POPSTAR Evolutionary Synthesis Models III: Photometric properties of young star clusters and mixed populations
• MEGARA-GTC Stellar Spectral Library (II). MEGASTAR First Release

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• Caveats about measuring carbon abundances in stars using the CH band