Publication: Gaia FGK benchmark stars: abundances of α and iron-peak elements
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2015-10
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Context. In the current era of large spectroscopic surveys of the Milky Way, reference stars for calibrating astrophysical parameters and chemical abundances are of paramount importance. Aims. We determine elemental abundances of Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Co, and Ni for our predefined set of Gaia FGK benchmark stars. Methods. By analysing high-resolution spectra with a high signal-to-noise ratio taken from several archive datasets, we combined results of eight different methods to determine abundances on a line-by-line basis. We performed a detailed homogeneous analysis of the systematic uncertainties, such as differential versus absolute abundance analysis. We also assessed errors that are due to non-local thermal equilibrium and the stellar parameters in our final abundances. Results. Our results are provided by listing final abundances and the different sources of uncertainties, as well as line-by-line and method-by-method abundances. Conclusions. The atmospheric parameters of the Gaia FGK benchmark stars are already being widely used for calibration of several pipelines that are applied to different surveys. With the added reference abundances of ten elements, this set is very suitable for calibrating the chemical abundances obtained by these pipelines.
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© ESO, 2015. Artículo firmado por 29 autores. P.J. is pleased to thank A. Casey for fruitful discussions and suggestions on the subject, and K. Hawkins and T. Madler for their support. We thank S. Hubrig for providing us with the as yet unpublished reduced spectrum of a Cen A. We also acknowledge the constructive report from the referee. This work was partly supported by the European Union FP7 programme through ERC grant number 320360 and also by the Leverhulme Trust through grant RPG-2012-541. U.H. acknowledges support from the Swedish National Space Board (Rymdstyrelsen). This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.
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