dc.contributor.author | Aguado, David S. | |
dc.contributor.author | Belokurov, Vasily | |
dc.contributor.author | Myeong, G. C. | |
dc.contributor.author | Evans, N. Wyn | |
dc.contributor.author | Kobayashi, Chiaki | |
dc.contributor.author | Sbordone, Luca | |
dc.contributor.author | Chanamé, Julio | |
dc.contributor.author | Navarrete, Camila | |
dc.contributor.author | Koposov, Sergey E. | |
dc.date.accessioned | 2021-05-06T07:48:56Z | |
dc.date.available | 2021-05-06T07:48:56Z | |
dc.date.issued | 2021-02-10 | |
dc.identifier.citation | Aguado , D S , Belokurov , V , Myeong , G C , Evans , N W , Kobayashi , C , Sbordone , L , Chanamé , J , Navarrete , C & Koposov , S E 2021 , ' Elevated r-process enrichment in Gaia Sausage and Sequoia ' , The Astrophysical Journal , vol. 908 , no. 1 , L8 . https://doi.org/10.3847/2041-8213/abdbb8 | |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2012.01430v1 | |
dc.identifier.other | ORCID: /0000-0002-4343-0487/work/93471146 | |
dc.identifier.uri | http://hdl.handle.net/2299/24419 | |
dc.description | © 2021. The American Astronomical Society. All rights reserved. | |
dc.description.abstract | The Gaia Sausage and the Sequoia represent the major accretion events that formed the stellar halo of the Milky Way. A detailed chemical study of these main building blocks provides a pristine view of the early steps of the Galaxy's assembly. We present the results of the analysis of the UVES high-resolution spectroscopic observations at the 8.2m VLT of 9 Sausage/Sequoia members selected kinematically using Gaia DR2. We season this set of measurements with archival data from Nissen & Schuster (2011) and GALAH DR3 (2020). Here, we focus on the neutron-capture process by analysing Sr, Y, Ba and Eu behavior. We detect clear enhancement in Eu abundance ([Eu/Fe]~0.6-0.7) indicative of large prevalence of r-process in the stellar n-capture makeup. We are also able to trace the evolution of the heavy element production across a wide range of metallicity. Barium to europium ratio changes from a tight, flat sequence with [Ba/Eu]=-0.7 reflecting dominant core-collapse SNe contribution, to a clear upturn at higher iron abundances, betraying the onset of contamination from asymptotic giant branch (AGB) ejecta. Additionally, we discover two clear sequences in [Fe/H]-[Ba/Fe] plane likely caused by distinct levels of s-process pollution and mixing within the GS progenitor. | en |
dc.format.extent | 2195086 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | astro-ph.GA | |
dc.title | Elevated r-process enrichment in Gaia Sausage and Sequoia | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.3847/2041-8213/abdbb8 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |