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The temporal evolution of neutron-capture elements in the Galactic discs

Spina, L; Melendez, Jorge; Karakas, A. I.; dos Santos, Leonardo; Bedell, Megan; Asplund, Martin; Ramirez, Ivan; Yong, David; Alves-Brito, A; Bean, Jacob; Dreizler, S

Description

Important insights into the formation and evolution of the Galactic disc(s) are contained in the chemical compositions of stars. We analysed high-resolution and high signal-to-noise HARPS spectra of 79 solar twin stars in order to obtain precise determinations of their atmospheric parameters, ages (sigma similar to 0.4 Gyr) and chemical abundances (sigma < 0.01 dex) of 12 neutron-capture elements (Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd and Dy). This valuable data set allows us to study the...[Show more]

dc.contributor.authorSpina, L
dc.contributor.authorMelendez, Jorge
dc.contributor.authorKarakas, A. I.
dc.contributor.authordos Santos, Leonardo
dc.contributor.authorBedell, Megan
dc.contributor.authorAsplund, Martin
dc.contributor.authorRamirez, Ivan
dc.contributor.authorYong, David
dc.contributor.authorAlves-Brito, A
dc.contributor.authorBean, Jacob
dc.contributor.authorDreizler, S
dc.date.accessioned2019-12-20T01:50:46Z
dc.date.available2019-12-20T01:50:46Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/196421
dc.description.abstractImportant insights into the formation and evolution of the Galactic disc(s) are contained in the chemical compositions of stars. We analysed high-resolution and high signal-to-noise HARPS spectra of 79 solar twin stars in order to obtain precise determinations of their atmospheric parameters, ages (sigma similar to 0.4 Gyr) and chemical abundances (sigma < 0.01 dex) of 12 neutron-capture elements (Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd and Dy). This valuable data set allows us to study the [X/Fe]-age relations over a time interval of similar to 10 Gyr and among stars belonging to the thin and thick discs. These relations show that (i) the s-process has been the main channel of nucleosynthesis of n-capture elements during the evolution of the thin disc; (ii) the thick disc is rich in r-process elements which suggests that its formation has been rapid and intensive. In addition, the heavy (Ba, La, Ce) and light (Sr, Y, Zr) s-process elements revealed details on the dependence between the yields of AGB stars and the stellar mass or metallicity. Finally, we confirmed that both [Y/Mg] and [Y/Al] ratios can be employed as stellar clocks, allowing ages of solar twin stars to be estimated with an average precision of similar to 0.5 Gyr.
dc.description.sponsorshipLS and JM acknowledge the support from FAPESP (2014/15706- 9 and 2012/24392-2). MA has been supported by the Australian Research Council (grant FL110100012).
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherOxford University Press
dc.rights© 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleThe temporal evolution of neutron-capture elements in the Galactic discs
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume474
dc.date.issued2018
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu4485658xPUB2272
local.publisher.urlhttps://academic.oup.com/
local.type.statusPublished Version
local.contributor.affiliationSpina, L, Universidade de São Paulo
local.contributor.affiliationMelendez, Jorge, University of Sao Paulo
local.contributor.affiliationKarakas, A. I., Monash University
local.contributor.affiliationdos Santos, Leonardo, Universidade de Sao Paulo
local.contributor.affiliationBedell, Megan, University of Chicago
local.contributor.affiliationAsplund, Martin, College of Science, ANU
local.contributor.affiliationRamirez, Ivan, Tacoma Community College
local.contributor.affiliationYong, David, College of Science, ANU
local.contributor.affiliationAlves-Brito, A, Universidade Federal do Rio Grande
local.contributor.affiliationBean, Jacob, University of Chicago
local.contributor.affiliationDreizler, S, University of Gottingen
dc.relationhttp://purl.org/au-research/grants/arc/FL110100012
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage2580
local.bibliographicCitation.lastpage2593
local.identifier.doi10.1093/mnras/stx2938
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2019-08-04T08:20:16Z
local.identifier.thomsonID000424343600083
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0035-8711/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 20/12/19). This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
CollectionsANU Research Publications

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