Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/30940
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Yoon, Jinmi | en_US |
dc.contributor.author | Beers, Timothy C. | en_US |
dc.contributor.author | Placco, Vinicius M. | en_US |
dc.contributor.author | Rasmussen, Kaitlin C. | en_US |
dc.contributor.author | CAROLLO, Daniela | en_US |
dc.contributor.author | He, Siyu | en_US |
dc.contributor.author | Hansen, Terese T. | en_US |
dc.contributor.author | Roederer, Ian U. | en_US |
dc.contributor.author | Zeanah, Jeff | en_US |
dc.date.accessioned | 2021-04-28T12:24:54Z | - |
dc.date.available | 2021-04-28T12:24:54Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30940 | - |
dc.description.abstract | We investigate anew the distribution of absolute carbon abundance, A(C) = log ∊(C), for carbon-enhanced metal-poor (CEMP) stars in the halo of the Milky Way, based on high-resolution spectroscopic data for a total sample of 305 CEMP stars. The sample includes 147 CEMP-s (and CEMP-r/s) stars, 127 CEMP-no stars, and 31 CEMP stars that are unclassified, based on the currently employed [Ba/Fe] criterion. We confirm previous claims that the distribution of A(C) for CEMP stars is (at least) bimodal, with newly determined peaks centered on A(C) = 7.96 (the high-C region) and A(C) = 6.28 (the low-C region). A very high fraction of CEMP-s (and CEMP-r/s) stars belongs to the high-C region, while the great majority of CEMP-no stars resides in the low-C region. However, there exists complexity in the morphology of the A(C)-[Fe/H] space for the CEMP-no stars, a first indication that more than one class of first-generation stellar progenitors may be required to account for their observed abundances. The two groups of CEMP-no stars we identify exhibit clearly different locations in the A(Na)-A(C) and A(Mg)-A(C) spaces, also suggesting multiple progenitors. The clear distinction in A(C) between the CEMP-s (and CEMP-r/s) stars and the CEMP-no stars appears to be as successful, and likely more astrophysically fundamental, for the separation of these sub-classes as the previously recommended criterion based on [Ba/Fe] (and [Ba/Eu]) abundance ratios. This result opens the window for its application to present and future large-scale low- and medium-resolution spectroscopic surveys. | en_US |
dc.language.iso | eng | en_US |
dc.title | Observational Constraints on First-star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-No Stars | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/833/1/20 | en_US |
dc.identifier.scopus | 2-s2.0-85006489852 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/833/1/20 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 833 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 20 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 9 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016ApJ...833...20Y | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering | 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.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.orcid | 0000-0002-0005-5787 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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File | Descrizione | Dimensioni | Formato | |
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1607.06336.pdf | preprint | 886.51 kB | Adobe PDF | Visualizza/apri |
Yoon_2016_ApJ_833_20.pdf | Pdf editoriale | 1.02 MB | Adobe PDF | Visualizza/apri |
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