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A Comparison of Stellar Elemental Abundance Techniques and Measurements

dc.contributor.authorHINKEL, Natalie R.,
hal.structure.identifierLaboratoire Jean Alexandre Dieudonné [LJAD]
dc.contributor.authorYOUNG, Patrick A.,
hal.structure.identifierInstitut méditerranéen d'océanologie [MIO]
dc.contributor.authorPAGANO, Michael D.,
dc.contributor.authorDESCH, Steven J.,
dc.contributor.authorANBAR, Ariel D.,
hal.structure.identifierCentro de Astrofísica da Universidade do Porto [CAUP]
dc.contributor.authorADIBEKYAN, Vardan,
hal.structure.identifierObservatoire Astronomique de l'Université de Genève [ObsGE]
dc.contributor.authorBLANCO-CUARESMA, S.
dc.contributor.authorCARLBERG, Joleen K.,
dc.contributor.authorDELGADO MENA, Elisa,
dc.contributor.authorLIU, Fan,
dc.contributor.authorNORDLANDER, Thomas,
dc.contributor.authorSOUSA, Sergio G.,
dc.contributor.authorKORN, Andreas,
dc.contributor.authorGRUYTERS, Pieter,
dc.contributor.authorHEITER, Ulrike,
dc.contributor.authorJOFRE, Paula,
hal.structure.identifierInstituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento em Lisboa [INESC-ID]
dc.contributor.authorSANTOS, Nuno C.,
hal.structure.identifierM2A 2016
dc.contributor.authorSOUBIRAN, C.
dc.date.issued2016-07
dc.identifier.issn0067-0049
dc.description.abstractEnStellar elemental abundances are important for understanding the fundamental properties of a star or stellar group, such as age and evolutionary history, as well as the composition of an orbiting planet. However, as abundance measurement techniques have progressed, there has been little standardization between individual methods and their comparisons. As a result, different stellar abundance procedures determine measurements that vary beyond quoted error for the same elements within the same stars (Hinkel et al. 2014). The purpose of this paper is to better understand the systematic variations between methods and offer recommendations for producing more accurate results in the future. We have invited a number of participants from around the world (Australia, Portugal, Sweden, Switzerland, and USA) to calculate ten element abundances (C, O, Na, Mg, Al, Si, Fe, Ni, Ba, and Eu) using the same stellar spectra for four stars (HD361, HD10700, HD121504, HD202206). Each group produced measurements for each of the stars using: 1) their own autonomous techniques, 2) standardized stellar parameters, 3) standardized line list, and 4) both standardized parameters and line list. We present the resulting stellar parameters, absolute abundances, and a metric of data similarity that quantifies homogeneity of the data. We conclude that standardization of some kind, particularly stellar parameters, improves the consistency between methods. However, because results did not converge as more free parameters were standardized, it is clear there are inherent issues within the techniques that need to be reconciled. Therefore, we encourage more conversation and transparency within the community such that stellar abundance determinations can be reproducible as well as accurate and precise.
dc.language.isofr
dc.publisherAmerican Astronomical Society
dc.titleA Comparison of Stellar Elemental Abundance Techniques and Measurements
dc.typeArticle de revue
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
dc.identifier.arxiv1607.03130
bordeaux.journalThe Astrophysical Journal Supplement
bordeaux.pagearXiv:1607.03130
bordeaux.peerReviewedoui
hal.identifierhal-01345217
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01345217v1
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