Stellar atmospheric parameters and the Gaia-ESO Survey experience with multiple analysis pipelines*

R. Smiljanic1†, A. J. Korn2, A. R. Casey3, and the Gaia-ESO Survey consortium4
1Nicolaus Copernicus Astronomical Centre, Polish Academy of Sciences, Bartycka 18, 00-716, Warsaw, Poland
2Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
3School of Physics and Astronomy, Monash University, Australia

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To use libraries of observed stellar spectra, one needs to know the atmospheric parameters of the stars associated to those spectra. It is, however, hard to know what are the real levels of precision and accuracy of the parameters. To overcome this very same problem in a stellar survey, the Gaia-ESO Survey implements a comprehensive calibration effort together with the use of multiple parallel analysis methodologies. This contribution discusses the multiple analyses approach and the e ort to understand the accuracy and precision of the stellar atmospheric parameters provided.

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Keywords : surveys – data analysis – fundamental parameters – late-type stars