Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26848
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Mucciarelli, A. | en_US |
dc.contributor.author | BELLAZZINI, Michele | en_US |
dc.contributor.author | Ibata, R. | en_US |
dc.contributor.author | ROMANO, Donatella | en_US |
dc.contributor.author | Chapman, S. C. | en_US |
dc.contributor.author | Monaco, L. | en_US |
dc.date.accessioned | 2020-08-26T15:14:30Z | - |
dc.date.available | 2020-08-26T15:14:30Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26848 | - |
dc.description.abstract | We present iron, magnesium, calcium, and titanium abundances for 235 stars in the central region of the Sagittarius dwarf spheroidal galaxy (within 9.0' ≃ 70 pc from the centre) from medium-resolution Keck/Deep Imaging Multi-Object Spectrograph spectra. All the considered stars belong to the massive globular cluster M 54 or to the central nucleus of the galaxy (Sgr, N). In particular we provide abundances for 109 stars with [Fe/H] ≥-1.0, more than doubling the available sample of spectroscopic metallicity and α-elements abundance estimates for Sgr dSph stars in this metallicity regime. We find for the first time a metallicity gradient in the Sgr, N population, whose peak iron abundance goes from [Fe/H] =-0.38 for R ≤ 2.5' to [Fe/H] =-0.57 for 5.0 <R ≤ 9.0'. On the other hand, the trends of [Mg/Fe], [Ca/Fe], and [Ti/Fe] with [Fe/H] are the same over the entire region explored by our study. We reproduce the observed chemical patterns of the Sagittarius dwarf spheroidal as a whole with a chemical evolution model which implies that a high mass progenitor (M<SUB>DM</SUB> = 6 × 10<SUP>10</SUP>M<SUB>☉</SUB>) and a significant event of mass-stripping occurred a few Gyr ago, presumably starting at the first peri-Galactic passage after infall. <P />Full Table 1 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/605/A46">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/605/A46</A> | en_US |
dc.language.iso | eng | en_US |
dc.title | Chemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201730707 | en_US |
dc.identifier.scopus | 2-s2.0-85029166573 | en_US |
dc.identifier.isi | 000412231200047 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2017/09/aa30707-17/aa30707-17.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 605 | en_US |
dc.relation.firstpage | A46 | 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 | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017A&A...605A..46M | 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 | OAS Bologna | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0001-8200-810X | - |
crisitem.author.orcid | 0000-0002-0845-6171 | - |
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 | |
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aa30707-17.pdf | pdf editoriale | 8.92 MB | Adobe PDF | View/Open |
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