Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/34350
DC Field | Value | Language |
---|---|---|
dc.contributor.author | CARRETTA, Eugenio | en_US |
dc.date.accessioned | 2023-07-27T08:30:11Z | - |
dc.date.available | 2023-07-27T08:30:11Z | - |
dc.date.issued | 2022 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/34350 | - |
dc.description.abstract | Among the multiple stellar populations in globular clusters (GCs) the very high-temperature H-burning regime, able to produce elements up to potassium, is still poorly explored. Here we present the first abundance analysis of K in 42 giants of NGC 6715 (M 54) with homogeneous abundances of light elements previously derived in our FLAMES survey. Owing to the large mass and low metallicity, a large excess of K could be expected in this GC, which is located in the nucleus of the Sagittarius dwarf galaxy. We actually found a spread in [K/Fe] spanning about 1 dex, with [K/Fe] presenting a significant anti-correlation with [O/Fe] ratios, regardless of the metallicity component in M 54. Evidence for a K–Mg anti-correlation also exists, but this is statistically marginal because of the lack of very Mg-poor stars in this GC. We found, however, a strong correlation between K and Ca. These observations clearly show that the K enhancement in M 54 is probably due to the same network of nuclear reactions generating the phenomenon of multiple stellar populations, at work in a regime of very high temperature. The comparison with recent results in ω Cen is hampered by an unexplained trend with the temperatures for K abundances from optical spectroscopy, and somewhat by a limited sample size for infrared APOGEE data. There are few doubts, however, that the two most massive GCs in the Milky Way host a K–Mg anti-correlation. | en_US |
dc.language.iso | eng | en_US |
dc.title | Multiple stellar populations in the high-temperature regime: Potassium abundances in the globular cluster M 54 (NGC 6715) | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/202244613 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2022/10/aa44613-22/aa44613-22.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 666 | en_US |
dc.relation.firstpage | A177 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 1 | en_US |
dc.description.international | no | en_US |
dc.contributor.country | ITA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | 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.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0002-1569-1911 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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aa44613-22.pdf | PDF editoriale | 366.14 kB | Adobe PDF | View/Open |
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