Gaia FGK benchmark stars: Metallicity

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

Research output: Contribution to journalArticlepeer-review

224 Citations (Scopus)


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. Aims. 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. Methods. 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. Results. 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.

Original languageEnglish
Article numberA133
JournalAstronomy and Astrophysics
Publication statusPublished - Apr 2014
Externally publishedYes


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