Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/34409
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Yong, D. | en_US |
dc.contributor.author | Da Costa, G. S. | en_US |
dc.contributor.author | Bessell, M. S. | en_US |
dc.contributor.author | Chiti, A. | en_US |
dc.contributor.author | Frebel, A. | en_US |
dc.contributor.author | Gao, X. | en_US |
dc.contributor.author | Lind, K. | en_US |
dc.contributor.author | Mackey, A. D. | en_US |
dc.contributor.author | MARINO, Anna | en_US |
dc.contributor.author | Murphy, S. J. | en_US |
dc.contributor.author | Nordlander, T. | en_US |
dc.contributor.author | Asplund, M. | en_US |
dc.contributor.author | Casey, A. R. | en_US |
dc.contributor.author | Kobayashi, C. | en_US |
dc.contributor.author | Norris, J. E. | en_US |
dc.contributor.author | Schmidt, B. P. | en_US |
dc.date.accessioned | 2023-09-29T10:30:08Z | - |
dc.date.available | 2023-09-29T10:30:08Z | - |
dc.date.issued | 2021 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/34409 | - |
dc.description.abstract | We 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_US |
dc.language.iso | eng | en_US |
dc.title | High-resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stab2001 | en_US |
dc.identifier.scopus | 2-s2.0-85117198172 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/507/3/4102/6321844 | en_US |
dc.identifier.url | https://api.elsevier.com/content/abstract/scopus_id/85117198172 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 507 | en_US |
dc.relation.issue | 3 | en_US |
dc.relation.firstpage | 4102 | en_US |
dc.relation.lastpage | 4119 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2021MNRAS.507.4102Y | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.orcid | 0000-0002-1276-5487 | - |
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