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Gaia FGK benchmark stars: Metallicity

P. Jofrť, U. Heiter, C. Soubiran, S. Blanco-Cuaresma, C. Worley, E. Pancino, T. Cantat-Gaudin, L. Magrini, M. Bergemann, J. I. GonzŠlez HernŠndez, V. Hill, C. Lardo, P. de Laverny, K. Lind, T. Masseron, D. Montes, A. Mucciarelli, T. Nordlander, A. Recio-Blanco, J. Sobeck, R. Sordo, S. G. Sousa, H. Tabernero, A. Vallenari, S. Van Eck

Context. To calibrate automatic pipelines that determine atmospheric parameters of stars, one needs a sample of stars, or “benchmark stars”, with well-defined parameters to be used as a reference.
We provide detailed documentation of the iron abundance determination of the 34 FGK-type benchmark stars that are selected to be the pillars for calibration of the one billion Gaia stars. They cover a wide range of temperatures, surface gravities, and metallicities.
Up to seven different methods were used to analyze an observed spectral library of high resolutions and high signal-to-noise ratios. The metallicity was determined by assuming a value of effective temperature and surface gravity obtained from fundamental relations; that is, these parameters were known a priori and independently from the spectra.
We present a set of metallicity values obtained in a homogeneous way for our sample of benchmark stars. In addition to this value, we provide detailed documentation of the associated uncertainties. Finally, we report a value of the metallicity of the cool giant ψ Phe for the first time.

standards – techniques: spectroscopic – surveys – stars: fundamental parameters

Astronomy and Astrophysics
Volume 564, Number of pages A133_1
2014 April

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda√ß√£o para a Ci√™ncia e a Tecnologia
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