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dc.contributor.authorYong, D.
dc.contributor.authorCosta, G. S. Da
dc.contributor.authorBessell, M. S.
dc.contributor.authorChiti, A.
dc.contributor.authorFrebel, A.
dc.contributor.authorGao, X.
dc.contributor.authorLind, K.
dc.contributor.authorMackey, A. D.
dc.contributor.authorMarino, A. F.
dc.contributor.authorMurphy, S. J.
dc.contributor.authorNordlander, T.
dc.contributor.authorAsplund, M.
dc.contributor.authorCasey, A. R.
dc.contributor.authorKobayashi, C.
dc.contributor.authorNorris, J. E.
dc.contributor.authorSchmidt, B. P.
dc.date.accessioned2023-10-18T09:30:02Z
dc.date.available2023-10-18T09:30:02Z
dc.date.issued2021-11-01
dc.identifier.citationYong , D , Costa , G S D , Bessell , M S , Chiti , A , Frebel , A , Gao , X , Lind , K , Mackey , A D , Marino , A F , Murphy , S J , Nordlander , T , Asplund , M , Casey , A R , Kobayashi , C , Norris , J E & Schmidt , B P 2021 , ' High resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1 ' , Monthly Notices of the Royal Astronomical Society , vol. 507 , no. 3 , pp. 4102-4119 . https://doi.org/10.1093/mnras/stab2001
dc.identifier.issn0035-8711
dc.identifier.otherArXiv: http://arxiv.org/abs/2107.06430v1
dc.identifier.otherORCID: /0000-0002-4343-0487/work/144966874
dc.identifier.urihttp://hdl.handle.net/2299/26936
dc.description© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1093/mnras/stab2001
dc.description.abstractWe present chemical abundances for 21 elements (from Li to Eu) in 150 metal-poor Galactic stars spanning -4.1 < [Fe/H] < -2.1. The targets were selected from the SkyMapper survey and include 90 objects with [Fe/H] ≤ -3 of which some 15 have [Fe/H] ≤ -3.5. When combining the sample with our previous studies, we find that the metallicity distribution function has a power-law slope of Δ(log N)/Δ[Fe/H] = 1.51 ± 0.01 dex per dex over the range -4 ≤ [Fe/H] ≤ -3. With only seven carbon-enhanced metal-poor stars in the sample, we again find that the selection of metal-poor stars based on SkyMapper filters is biased against highly carbon-rich stars for [Fe/H] > -3.5. Of the 20 objects for which we could measure nitrogen, 11 are nitrogen-enhanced metal-poor (NEMP) stars. Within our sample, the high NEMP fraction (55 per cent ± 21 per cent) is compatible with the upper range of predicted values (between 12 per cent and 35 per cent). The chemical abundance ratios [X/Fe] versus [Fe/H] exhibit similar trends to previous studies of metal-poor stars and Galactic chemical evolution models. We report the discovery of nine new r-I stars, four new r-II stars, one of which is the most metal-poor known, nine low-α stars with [α/Fe] ≤ 0.15 as well as one unusual star with [Zn/Fe] = +1.4 and [Sr/Fe] = +1.2 but with normal [Ba/Fe]. Finally, we combine our sample with literature data to provide the most extensive view of the early chemical enrichment of the Milky Way Galaxy.en
dc.format.extent18
dc.format.extent2108122
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectastro-ph.GA
dc.subjectastro-ph.SR
dc.subjectearly universe
dc.subjectstars: Population II
dc.subjectGalaxy: abundances
dc.subjectstars: abundances
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleHigh resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1en
dc.contributor.institutionCentre for Astrophysics Research (CAR)
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85117198172&partnerID=8YFLogxK
rioxxterms.versionofrecord10.1093/mnras/stab2001
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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