Atomic data for the Gaia-ESO Survey
arXiv:2011.02049 · doi:10.1051/0004-6361/201936291
Abstract
We describe the atomic and molecular data that were used for the abundance analyses of FGK-type stars carried out within the Gaia-ESO Survey. We present an unprecedented effort to create a homogeneous line list, which was used by several abundance analysis groups to calculate synthetic spectra and equivalent widths. The atomic data are accompanied by quality indicators and detailed references to the sources. The atomic and molecular data are made publicly available in electronic form. In general experimental transition probabilities were preferred but theoretical values were also used. Astrophysical gf-values were avoided due to the model-dependence of such a procedure. For elements whose lines are significantly affected by hyperfine structure or isotopic splitting a concerted effort has been made to collate the necessary data for the individual line components. We also performed a detailed investigation of available data for line broadening due to collisions with neutral hydrogen atoms. Synthetic spectra calculated for the Sun and Arcturus were used to assess the blending properties of the lines. Among a subset of over 1300 lines of 35 elements in the wavelength ranges from 475 nm to 685 nm and from 850 nm to 895 nm we identified about 200 lines of 24 species which have accurate gf-values and are free of blends in the spectra of the Sun and Arcturus. For the broadening due to collisions with neutral hydrogen we recommend data based on Anstee-Barklem-O'Mara theory, where available, and to avoid lines of neutral species otherwise. Theoretical broadening data by R.L. Kurucz should be used for Sc II, Ti II, and Y II lines. For ionised rare-earth species the Unsöld approximation with an enhancement factor of 1.5 for the line width can be used. Desirable improvements in atomic data were identified for a number of species, including Al I, S I, Cr II, Na I, Si I, Ca II, and Ni I.
Accepted for publication in section 12. Atomic, molecular, and nuclear data of Astronomy and Astrophysics; main part 25 pages, 8 tables, 5 figures; appendices 53 pages, 23 tables, 29 figures
References in corpus (32)
- A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
- The GALAH Survey: Scientific Motivation
- CH in stellar atmospheres: an extensive linelist
- The elemental composition of the Sun II. The iron group elements Sc to Ni
- DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
- The Gaia-ESO Survey: the Galactic Thick to Thin Disc transition
- The elemental composition of the Sun I. The intermediate mass elements Na to Ca
- The 2020 release of the ExoMol database: molecular line lists for exoplanet and other hot atmospheres
- Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
- The elemental composition of the Sun III. The heavy elements Cu to Th
- New Rare Earth Element Abundance Distributions for the Sun and Five r-Process-Rich Very Metal-Poor Stars
- A non-LTE study of neutral and singly-ionized calcium in late-type stars
- Both accurate and precise gf-values for FeII lines
- Improved Laboratory Transition Probabilities for Neutral Chromium and Re-determination of the Chromium Abundance for the Sun and Three Stars
- Line lists for the A2PI-X2Sigma+ (red) and {B2Sigma+-X2Sigma} (violet) Systems of CN, 13C14N, and 12C15N, and Application to Astronomical Spectra
- Improved Laboratory Transition Probabilities for Ce II, Application to the Cerium Abundances of the Sun and Five r-process Rich, Metal-Poor Stars, and Rare Earth Lab Data
- Non-LTE aluminium abundances in late-type stars
- The Gaia FGK Benchmark Stars - High resolution spectral library
- The Gaia-ESO Survey: the chemical structure of the Galactic discs from the first internal data release
- Fe I Oscillator Strengths for the Gaia-ESO Survey
- Improved Laboratory Transition Probabilities for Er II and Applications to the Erbium Abundances of the Sun and Five r-Process Rich, Metal-Poor Stars
- Fe I Oscillator Strengths for Transitions from High-lying Even-Parity Levels
- Experimental and theoretical oscillator strengths of Mg I for accurate abundance analysis
- Rare-earth elements in the atmosphere of the magnetic chemically peculiar star HD 144897. New classification of the Nd III spectrum
- The AMBRE Project: Constraining the lithium evolution in the Milky Way
- The Gaia-ESO Survey: calibration strategy
- The Gaia-ESO Survey: CNO abundances in the open clusters Trumpler 20, NGC 4815, and NGC 6705
- The Gaia-ESO Survey: A globular cluster escapee in the Galactic halo
- Gaia-ESO Survey: The analysis of pre-main sequence stellar spectra
- Experimental Mg I oscillator strengths and radiative lifetimes for astrophysical applications on metal-poor stars - New data for the Mg I b triplet
- Precision measurement of the branching ratio in the 6P3/2 decay of BaII with a single trapped ion
- New Fe I level energies and line identifications from stellar spectra