Gaia FGK Benchmark Stars - Metallicity

P. Jofre 1 U. Heiter C. Soubiran 1 S. Blanco-Cuaresma 1 E. Pancino M. Bergemann T. Cantat-Gaudin J. I. González Hernández V. Hill C. Lardo P. De Laverny K. Lind L. Magrini 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 2 C. C. Worley
1 M2A 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : To calibrate automatic pipelines that determine atmospheric parameters of stars, one needs a sample of stars -- ''benchmark stars'' -- with well defined parameters to be used as a reference We provide a detailed documentation of the determination of the iron abundance of the 34 FGK-type benchmark stars 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 resolution and high signal-to-noise ratio. The metallicity was determined assuming a value of effective temperature and surface gravity obtained from fundamental relations, i.e. these parameters were known a priori 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 a detailed documentation of the associated uncertainties. Finally, we report for the first time a value of the metallicity of the cool giant psi Phe.
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Contributeur : Marie-Paule Pomies <>
Soumis le : jeudi 5 septembre 2013 - 11:41:32
Dernière modification le : mardi 29 mai 2018 - 12:51:06

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P. Jofre, U. Heiter, C. Soubiran, S. Blanco-Cuaresma, E. Pancino, et al.. Gaia FGK Benchmark Stars - Metallicity. Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 564, 〈10.1051/0004-6361/201322440〉. 〈hal-00858346〉



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