Gaia FGK benchmark stars: Metallicity

By Paulina Jofré, U. Heiter, C. Soubiran, Sergi Blanco-Cuaresma, C. Worley, E. Pancino, T. Cantat-Gaudin, Laura Magrini, M. Bergemann, José A. Gómez Hernández and 15 more. 2013

213 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/1517459ffa4e9ddb61fadc9be43b5586c59e1ecc

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In Astronomy and Astrophysics

Citations in the corpus

The GALAH survey: scientific motivation (2015, methodology): “…diagram of different galactic populations from a synthetic GALAH survey, based on Galaxia (Sharma et al. 2011). observation of regular GALAH fields are halted, although bright calibration observations, such as Gaia benchmarks stars (Jofré et al. 2014) can be carried out if clear skies prevail.”
Gaia FGK benchmark stars: Effective temperatures and surface gravities (2015, methodology): “In the third article (Jofré et al. 2014b, hereafter Paper III), the fundamental Teff and log g and the spectral libraries were used for metallicity determinations, based on the analysis of Fe lines by several methods.”
THE RADIAL VELOCITY EXPERIMENT (RAVE): FIFTH DATA RELEASE (2013, methodology): “Although the V16 and Jofré et al. (2014) derivations of log g are independent of each other, the shifts in log g between the two samples are small, so there is no concern that we could end up with non-physical combinations of parameters.”
Stellar and substellar companions of nearby stars from Gaia DR2 (2018, background): “The secondary component 61 Cyg B is one of the 34 Gaia benchmark stars (Jofré et al. 2014; Heiter et al. 2015).”