1. Gaia FGK benchmark stars: abundances of α and iron-peak elements
- Author
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Rosanna Sordo, Caroline Soubiran, A. Hourihane, Tristan Cantat-Gaudin, Elena Pancino, Alejandra Recio-Blanco, Carmela Lardo, L. Chemin, J. I. González Hernández, Gerry Gilmore, Ulrike Heiter, S. G. Sousa, Vardan Adibekyan, Elisa Delgado-Mena, Šarūnas Mikolaitis, S. Blanco-Cuaresma, Guillaume Guiglion, D. Montes, Maria Bergemann, Hugo M. Tabernero, Thomas Masseron, S. Van Eck, Antonella Vallenari, P. de Laverny, Clare Worley, Karin Lind, Paula Jofre, Thomas Nordlander, Laura Magrini, M2A 2015, Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire Astronomique de l'Université de Genève (ObsGE), Université de Genève (UNIGE), Institut d'Astronomie et d'Astrophysique, Université libre de Bruxelles (ULB), Jofre P., Heiter U., Soubiran C., Blanco-Cuaresma S., Masseron T., Nordlander T., Chemin L., Worley C.C., Van Eck S., Hourihane A., Gilmore G., Adibekyan V., Bergemann M., Cantat-Gaudin T., Delgado-Mena E., Gonzalez Hernandez J.I., Guiglion G., Lardo C., De Laverny P., Lind K., Magrini L., Mikolaitis S., Montes D., Pancino E., Recio-Blanco A., Sordo R., Sousa S., Tabernero H.M., and Vallenari A.
- Subjects
Astrofísica ,Milky Way ,FOS: Physical sciences ,Astrophysics ,Spectral line ,Astronomi, astrofysik och kosmologi ,Abundance (ecology) ,stars: atmospheres ,data analysis [methods] ,Calibration ,Astronomy, Astrophysics and Cosmology ,Astrophysics::Solar and Stellar Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,QC ,QB ,atmospheres [stars] ,Physics ,abundances [Galaxy] ,Astronomy and Astrophysics ,Iron peak ,methods: data analysis ,[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] ,Galaxy: abundance ,Astronomía ,Stars ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Homogeneous ,Benchmark (computing) ,Galaxy: abundances ,Astrophysics::Earth and Planetary Astrophysics ,Methods: data analysi - Abstract
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. 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. 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. 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. 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., Comment: Accepted for publication in A&A, Printer format: 65 pages, 18 figures, 25 tables
- Published
- 2015