Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/32503
DC Field | Value | Language |
---|---|---|
dc.contributor.author | François, P. | en_US |
dc.contributor.author | Caffau, E. | en_US |
dc.contributor.author | Bonifacio, P. | en_US |
dc.contributor.author | Spite, M. | en_US |
dc.contributor.author | Spite, F. | en_US |
dc.contributor.author | Cayrel, R. | en_US |
dc.contributor.author | Christlieb, N. | en_US |
dc.contributor.author | Gallagher, A. J. | en_US |
dc.contributor.author | Klessen, R. | en_US |
dc.contributor.author | Koch, A. | en_US |
dc.contributor.author | Ludwig, H. -G. | en_US |
dc.contributor.author | Monaco, L. | en_US |
dc.contributor.author | Plez, B. | en_US |
dc.contributor.author | Steffen, M. | en_US |
dc.contributor.author | ZAGGIA, Simone | en_US |
dc.date.accessioned | 2022-07-15T09:20:54Z | - |
dc.date.available | 2022-07-15T09:20:54Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/32503 | - |
dc.description.abstract | Context. Extremely metal-poor stars are keys to understand the early evolution of our Galaxy. The ESO large programme TOPoS has been tailored to analyse a new set of metal-poor turn-off stars, whereas most of the previously known extremely metal-poor stars are giant stars. Aims: Sixty five turn-off stars (preselected from SDSS spectra) have been observed with the X-shooter spectrograph at the ESO VLT Unit Telescope 2, to derive accurate and detailed abundances of magnesium, silicon, calcium, iron, strontium and barium. Methods: We analysed medium-resolution spectra (R ≃ 10 000) obtained with the ESO X-shooter spectrograph and computed the abundances of several α and neutron-capture elements using standard one-dimensional local thermodynamic equilibrium (1D LTE) model atmospheres. Results: Our results confirms the super-solar [Mg/Fe] and [Ca/Fe] ratios in metal-poor turn-off stars as observed in metal-poor giant stars. We found a significant spread of the [α/Fe] ratios with several stars showing subsolar [Ca/Fe] ratios. We could measure the abundance of strontium in 12 stars of the sample, leading to abundance ratios [Sr/Fe] around the Solar value. We detected barium in two stars of the sample. One of the stars (SDSS J114424-004658) shows both very high [Ba/Fe] and [Sr/Fe] abundance ratios (>1 dex). Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme ID 189.D-0165.Equivalent widths of the Fe lines are only, and Tables A.1 and A.2 are also available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A187">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A187</A> | en_US |
dc.language.iso | eng | en_US |
dc.title | TOPoS. V. Abundance ratios in a sample of very metal-poor turn-off stars | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201834375 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2018/12/aa34375-18/aa34375-18.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 620 | en_US |
dc.relation.firstpage | A187 | en_US |
dc.relation.lastpage | A195 | en_US |
dc.relation.numberofpages | 9 | en_US |
dc.relation.article | 5 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 15 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | USA | en_US |
dc.contributor.country | GBR | en_US |
dc.contributor.country | FRA | en_US |
dc.contributor.country | DEU | en_US |
dc.contributor.country | ESP | 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.identifier.adsbibcode | 2018A&A...620A.187F | 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::PE9_6 Stars and stellar systems | 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. Padova | - |
crisitem.author.orcid | 0000-0001-6081-379X | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
aa34375-18.pdf | PDF editoriale | 1.69 MB | Adobe PDF | View/Open |
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