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Gaia FGK benchmark stars: abundances of alpha and iron-peak elements

Jofre, P and Heiter, U and Soubiran, C and Blanco-Cuaresma, S and Masseron, T and Nordlander, T and Chemin, L and Worley, CC and Van Eck, S and Hourihane, A and Gilmore, G and Adibekyan, V and Bergemann, M and Cantat-Gaudin, T and Delgado-Mena, E and Gonzalez Hernandez, JI and Guiglion, G and Lardo, C and de Laverny, P and Lind, K and Magrini, L and Mikolaitis, S and Montes, D and Pancino, E and Recio-Blanco, A and Sordo, R and Sousa, S and Tabernero, HM and Vallenari, A (2015) Gaia FGK benchmark stars: abundances of alpha and iron-peak elements. Astronomy and Astrophysics, 582. ISSN 0004-6361

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Abstract

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 ofMg, Si, Ca, Sc, Ti, V, Cr,Mn, Co and Ni for our predefined set of Gaia FGK benchmark stars.
Methods. By analysing high-resolution and high-signal to noise spectra taken from several archive datasets, we combined results of eight different methods to determine abundances on a line-by-line basis. We perform a detailed homogeneous analysis of the systematic uncertainties, such as differential versus absolute abundance analysis, as well as we assess errors due to NLTE 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 Gaia FGK benchmark stars atmospheric parameters are already being widely used for calibration of several pipelines applied to different surveys. With the added reference abundances of 10 elements this set is very suitable to calibrate the chemical abundances obtained by these pipelines.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Related URLs:
Date Deposited: 22 Nov 2016 12:42
Last Modified: 08 Sep 2017 00:43
DOI or Identification number: 10.1051/0004-6361/201526604
URI: http://researchonline.ljmu.ac.uk/id/eprint/4842

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