Journal
ASTRONOMY & ASTROPHYSICS
Volume 564, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201322440
Keywords
standards; techniques: spectroscopic; surveys; stars: fundamental parameters
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Funding
- Swedish National Space Board (Rymdstyrelsen)
- Fundacao para a Ciencia e Tecnologia (Portugal) [SERH/BPD/47611/2008]
- ASI (Agenzia Spaziale Italians) [I/037/08/0, I/058/10/0]
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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 psi Phe for the first time.
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