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Gaia FGK Benchmark stars: Opening the black box of stellar element abundance determination

dc.contributor.authorJOFRE, P.
dc.contributor.authorHEITER, U.
dc.contributor.authorWORLEY, C. C.
hal.structure.identifierObservatoire Astronomique de l'Université de Genève [ObsGE]
dc.contributor.authorBLANCO-CUARESMA, S.
hal.structure.identifierM2A 2017
dc.contributor.authorSOUBIRAN, C.
hal.structure.identifierInstitute of Astronomy [Cambridge]
dc.contributor.authorMASSERON, T.
dc.contributor.authorHAWKINS, K.
hal.structure.identifierCentro de Astrofísica da Universidade do Porto [CAUP]
dc.contributor.authorADIBEKYAN, V.
dc.contributor.authorBUDER, S.
dc.contributor.authorCASAMIQUELA, L.
dc.contributor.authorGILMORE, G.
dc.contributor.authorHOURIHANE, A.
dc.contributor.authorTABERNERO, H.
dc.date.issued2017
dc.identifier.issn0004-6361
dc.description.abstractEnGaia and its complementary spectroscopic surveys combined will yield the most comprehensive database of kinematic and chemical information of stars in the Milky Way. The Gaia FGK benchmark stars play a central role in this matter as they are calibration pillars for the atmospheric parameters and chemical abundances for various surveys. The spectroscopic analyses of the benchmark stars are done by combining different methods, and the results will be affected by the systematic uncertainties inherent in each method. In this paper we explore some of these systematic uncertainties. We determined line abundances of Ca, Cr, Mn and Co for four benchmark stars using six different methods. We changed the default input parameters of the different codes in a systematic way and found in some cases significant differences between the results. Since there is no consensus on the correct values for many of these default parameters, we urge the community to raise discussions towards standard input parameters that could alleviate the difference in abundances obtained by different methods. In this work we provide quantitative estimates of uncertainties in elemental abundances due to the effect of differing technical assumptions in spectrum modelling.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Astrophysics of Galaxies
dc.subject.enAstrophysics - Solar and Stellar Astrophysics
dc.title.enGaia FGK Benchmark stars: Opening the black box of stellar element abundance determination
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201629833
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
dc.identifier.arxiv1612.05013
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A38
bordeaux.volume601
bordeaux.peerReviewedoui
hal.identifierhal-01420821
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01420821v1
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