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http://hdl.handle.net/20.500.12386/34327
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Salgado, C | en_US |
dc.contributor.author | Da Costa, G S | en_US |
dc.contributor.author | Yong, D | en_US |
dc.contributor.author | Salinas, R | en_US |
dc.contributor.author | Norris, J E | en_US |
dc.contributor.author | Mackey, A D | en_US |
dc.contributor.author | MARINO, Anna | en_US |
dc.contributor.author | Milone, A P | en_US |
dc.date.accessioned | 2023-07-24T13:55:08Z | - |
dc.date.available | 2023-07-24T13:55:08Z | - |
dc.date.issued | 2022 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/34327 | - |
dc.description.abstract | Using spectra obtained with the VLT/FORS2 and Gemini-S/GMOS instruments we have investigated carbon, nitrogen and sodium abundances in a sample of red giants in the Small Magellanic Cloud cluster Kron 3. The metallicity and luminosity of this cluster are comparable to those of Galactic globular clusters although with a notably younger age of $\sim$ 6.5 Gyr. Specifically we have investigated the strengths of the CH ($\lambda$ 4300 A) and CN ($\lambda$ 3800, $\lambda$ 4215) molecular bands finding a bimodality of CN band-strengths and a CH/CN anti-correlation. Application of spectrum synthesis techniques reveals a large spread ($\sim$1.2 dex) in nitrogen abundance and a spread in [C/Fe] of $\sim$0.3 dex after applying corrections for evolutionary mixing. We have also estimated sodium abundances from the strengths of the Na D lines finding a range of $\sim$0.8 dex in [Na/Fe] that correlates positively with the N abundances. This is the first star-by-star spectroscopic demonstration of correlated Na, N abundance variations in an intermediate-age star cluster, adding to existing photometric and spectroscopic indications of the presence of multiple populations in such clusters with masses in excess of $\sim 10^5$ solar masses. Our results confirm that the mechanism(s) responsible for the multiple populations observed in globular clusters cannot be an early cosmological effect applying only in old clusters, and provide a key additional factor in the quest to understand the origin of the abundance anomalies. | en_US |
dc.language.iso | eng | en_US |
dc.title | Evidence of globular cluster abundance anomalies in the SMC intermediate-age cluster Kron 3 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stac1724 | en_US |
dc.identifier.scopus | 2-s2.0-85138603326 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/515/2/2511/6612747 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 515 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 2511 | en_US |
dc.relation.lastpage | 2528 | 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.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.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.orcid | 0000-0002-1276-5487 | - |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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