Atomic data for the Gaia-ESO Survey
Ulrike Heiter, Karin Lind, Maria Bergemann, Martin Asplund,, \v{S}arunas Mikolaitis, Paul S. Barklem, Thomas Masseron, Patrick de Laverny,, Laura Magrini, Bengt Edvardsson, Henrik J\"onsson, Juliet C. Pickering, Nils, Ryde, Amelia Bayo Ar\'an, Thomas Bensby, Andrew R. Casey

TL;DR
This paper details the compilation and validation of atomic and molecular data crucial for stellar abundance analysis in the Gaia-ESO Survey, emphasizing data quality, line selection, and broadening effects.
Contribution
It provides a homogeneous, high-quality line list with detailed atomic data, including hyperfine and isotopic information, for accurate spectral analysis in the Gaia-ESO Survey.
Findings
Identified about 200 reliable spectral lines for abundance analysis.
Recommended specific broadening data sources for different elements.
Highlighted areas for future atomic data improvements.
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…
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