dc.contributor.author | Fishlock, C. K. | |
dc.contributor.author | Yong, D. | |
dc.contributor.author | Karakas, A. I. | |
dc.contributor.author | Alves-Brito, A. | |
dc.contributor.author | Melendez, J. | |
dc.contributor.author | Nissen, P. E. | |
dc.contributor.author | Kobayashi, C. | |
dc.contributor.author | Casey, A. R. | |
dc.date.accessioned | 2018-09-12T00:13:08Z | |
dc.date.available | 2018-09-12T00:13:08Z | |
dc.date.issued | 2017-05-01 | |
dc.identifier.citation | Fishlock , 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.issn | 0035-8711 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1701.02423v1 | |
dc.identifier.other | ORCID: /0000-0002-4343-0487/work/62750496 | |
dc.identifier.uri | https://arxiv.org/abs/1701.02423 | |
dc.description | 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. | |
dc.description.abstract | We 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.format.extent | 495042 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | astro-ph.SR | |
dc.subject | astro-ph.GA | |
dc.title | Sc and neutron-capture abundances in Galactic low- and high-alpha field halo stars | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
dc.identifier.url | https://arxiv.org/abs/1701.02423 | |
rioxxterms.versionofrecord | 10.1093/mnras/stx047 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |