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dc.contributor.authorFishlock, C. K.
dc.contributor.authorYong, D.
dc.contributor.authorKarakas, A. I.
dc.contributor.authorAlves-Brito, A.
dc.contributor.authorMelendez, J.
dc.contributor.authorNissen, P. E.
dc.contributor.authorKobayashi, C.
dc.contributor.authorCasey, A. R.
dc.date.accessioned2018-09-12T00:13:08Z
dc.date.available2018-09-12T00:13:08Z
dc.date.issued2017-05-01
dc.identifier.citationFishlock , C K , Yong , D , Karakas , A I , Alves-Brito , A , Melendez , J , Nissen , P E , Kobayashi , C & Casey , A R 2017 , ' Sc and neutron-capture abundances in Galactic low- and high-alpha field halo stars ' , Monthly Notices of the Royal Astronomical Society , vol. 466 , no. 4 , pp. 4672–4682 . https://doi.org/10.1093/mnras/stx047
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 14856616
dc.identifier.otherPURE UUID: 3d86cdd3-7f6b-4094-96d3-1cb380ee12c3
dc.identifier.otherArXiv: http://arxiv.org/abs/1701.02423v1
dc.identifier.otherORCID: /0000-0002-4343-0487/work/62750496
dc.identifier.urihttps://arxiv.org/abs/1701.02423
dc.descriptionThis 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.
dc.description.abstractWe determine relative abundance ratios for the neutron-capture elements Zr, La, Ce, Nd and Eu for a sample of 27 Galactic dwarf stars with −1.5 < [Fe/H] < −0.8. We also measure the iron-peak element Sc. These stars separate into three populations (low- and high-α halo and thick-disc stars) based on the [α/Fe] abundance ratio and their kinematics as discovered by Nissen & Schuster. We find differences between the low- and high-α groups in the abundance ratios of [Sc/Fe], [Zr/Fe], [La/Zr], [Y/Eu] and [Ba/Eu] when including Y and Ba from Nissen & Schuster. For all ratios except [La/Zr], the low-α stars have a lower abundance compared to the high-α stars. The low-α stars display the same abundance patterns of high [Ba/Y] and low [Y/Eu] as observed in present-day dwarf spheroidal galaxies, although with smaller abundance differences, when compared to the high-α stars. These distinct chemical patterns have been attributed to differences in the star formation rate between the two populations and the contribution of low-metallicity, low-mass asymptotic giant branch (AGB) stars to the low-α population. By comparing the low-α population with AGB stellar models, we place constraints on the mass range of the AGB stars.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectastro-ph.SR
dc.subjectastro-ph.GA
dc.titleSc and neutron-capture abundances in Galactic low- and high-alpha field halo starsen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.identifier.urlhttps://arxiv.org/abs/1701.02423
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2017-05-01
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stx047
rioxxterms.licenseref.uriOther
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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