Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/24713
DC Field | Value | Language |
---|---|---|
dc.contributor.author | CRISTALLO, Sergio | en_US |
dc.contributor.author | Karinkuzhi, D. | en_US |
dc.contributor.author | Goswami, A. | en_US |
dc.contributor.author | PIERSANTI, Luciano | en_US |
dc.contributor.author | Gobrecht, D. | en_US |
dc.date.accessioned | 2020-05-12T08:03:27Z | - |
dc.date.available | 2020-05-12T08:03:27Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24713 | - |
dc.description.abstract | We analyze a set of published elemental abundances from a sample of CH stars which are based on high resolution spectral analysis of ELODIE and SUBARU/HDS spectra. All the elemental abundances were derived from local thermodynamic equilibrium analysis using model atmospheres, and thus they represent the largest homogeneous abundance data available for CH stars to date. For this reason, we can use the set to constrain the physics and the nucleosynthesis occurring in low mass asymptotic giant branch (AGB) s.tars. CH stars have been polluted in the past from an already extinct AGB companion and thus show s-process enriched surfaces. We discuss the effects induced on the surface AGB s-process distributions by different prescriptions for convection and rotation. Our reference theoretical FRUITY set fits only part of the observations. Moreover, the s-process observational spread for a fixed metallicity cannot be reproduced. At [Fe/H] > -1, a good fit is found when rotation and a different treatment of the inner border of the convective envelope are simultaneously taken into account. In order to increase the statistics at low metallicities, we include in our analysis a selected number of CEMP stars and, therefore, we compute additional AGB models down to [Fe/H] = -2.85. Our theoretical models are unable to attain the large [hs/ls] ratios characterizing the surfaces of those objects. We speculate on the reasons for such a discrepancy, discussing the possibility that the observed distribution is a result of a proton mixing episode leading to a very high neutron density (the so-called I-process). | en_US |
dc.language.iso | eng | en_US |
dc.title | Constraints of the Physics of Low-mass AGB Stars from CH and CEMP Stars | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/833/2/181 | en_US |
dc.identifier.scopus | 2-s2.0-85007554510 | en_US |
dc.identifier.isi | 000391169600056 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/833/2/181 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 833 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 181 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 5 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | IND | 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..181C | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | 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. Abruzzo | - |
crisitem.author.dept | O.A. Abruzzo | - |
crisitem.author.orcid | 0000-0001-9683-9406 | - |
crisitem.author.orcid | 0000-0002-8758-244X | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Cristallo_2016_ApJ_833_181.pdf | pdf editoriale | 548.82 kB | Adobe PDF | View/Open |
Page view(s)
48
checked on Apr 26, 2024
Download(s)
14
checked on Apr 26, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.