Gaia FGK Benchmark stars: Opening the black box of stellar element abundance determination

Abstract

Gaia and its complementary spectroscopic surveys combined will yield the most comprehensive database of kinematic and chemical information of stars in the Milky Way. The Gaia FGK benchmark stars play a central role in this matter as they are calibration pillars for the atmospheric parameters and chemical abundances for various surveys. The spectroscopic analyses of the benchmark stars are done by combining different methods, and the results will be affected by the systematic uncertainties inherent in each method. In this paper we explore some of these systematic uncertainties. We determined line abundances of Ca, Cr, Mn and Co for four benchmark stars using six different methods. We changed the default input parameters of the different codes in a systematic way and found in some cases significant differences between the results. Since there is no consensus on the correct values for many of these default parameters, we urge the community to raise discussions towards standard input parameters that could alleviate the difference in abundances obtained by different methods. In this work we provide quantitative estimates of uncertainties in elemental abundances due to the effect of differing technical assumptions in spectrum modelling.

A&A accepted

References in corpus (22)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The GALAH Survey: Scientific Motivation
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• Stellar Abundances in the Solar Neighborhood: The Hypatia Catalog
• High-precision abundances of elements in solar twin stars: Trends with stellar age and elemental condensation temperature
• DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
• Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
• ARES v2 - new features and improved performance
• Chemical abundances of 451 stars from the HARPS GTO planet search program: Thin disc, thick disc, and planets
• Improved Laboratory Transition Probabilities for Neutral Chromium and Re-determination of the Chromium Abundance for the Sun and Three Stars
• Automated derivation of stellar atmospheric parameters and chemical abundances: the MATISSE algorithm
• The Gaia FGK Benchmark Stars - High resolution spectral library
• Stellar parameters and chemical abundances of 223 evolved stars with and without planets
• Atomic and Molecular Data for Optical Stellar Spectroscopy
• Exploring the alpha-enhancement of metal-poor planet-hosting stars. The Kepler and HARPS samples
• A Comparison of Stellar Elemental Abundance Techniques and Measurements
• Testing the chemical tagging technique with open clusters
• Manganese trends in a sample of thin and thick disk stars. The origin of Mn
• On the Relative Ages of the $\alpha$-Rich and $\alpha$-Poor Stellar Populations in the Galactic Halo
• Abundances of Mn, Co and Eu in a sample of 20 F-G disk stars: the influence of hyperfine structure splitting
• New Teff and [Fe/H] spectroscopic calibration for FGK dwarfs and GK giants

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• Method to Estimate the Effective Temperatures of Late-Type Giants using Line-Depth Ratios in the Wavelength Range 0.97-1.32$\mu$m
• Titans metal-poor reference stars. I. Accurate effective temperatures and surface gravities for dwarfs and subgiants from 3D non-LTE H$\alpha$ profiles and Gaia parallaxes
• The AMBRE Project: Spectrum normalisation influence on Mg abundances in the metal-rich Galactic disc
• The Gaia-ESO Survey: The inner disc, intermediate-age open cluster Pismis 18
• The atmospheric parameters of FGK stars using wavelet analysis of CORALIE spectra
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• Titans metal-poor reference stars II. Red giants and CEMP stars
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• WASP 0639-32: a new F-type subgiant/K-type main-sequence detached eclipsing binary from the WASP project
• Gemini-GRACES high-quality spectra of Kepler evolved stars with transiting planets I. Detailed characterization of multi-planet systems Kepler-278 and Kepler-391
• Validating Stellar Abundance Measurements from Multi-Resolution Spectroscopy
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• J01020100-7122208: an accreted evolved blue straggler that wasn't ejected from a supermassive black hole
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• LRPayne: Stellar parameters and abundances from low-resolution spectra