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Gaia FGK benchmark stars: Metallicity
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
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2014 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 564, A133- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 564, A133- p.
Keyword [en]
standards, techniques: spectroscopic, surveys, stars: fundamental parameters
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-225067DOI: 10.1051/0004-6361/201322440ISI: 000334671000133OAI: oai:DiVA.org:uu-225067DiVA: diva2:727610
Available from: 2014-06-23 Created: 2014-05-27 Last updated: 2014-06-23Bibliographically approved

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Heiter, UlrikeNordlander, Thomas
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Observational AstronomyDepartment of Physics and Astronomy
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