Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/26687
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Martínez-Vázquez, C. E. | en_US |
dc.contributor.author | Monelli, M. | en_US |
dc.contributor.author | Bono, G. | en_US |
dc.contributor.author | Stetson, P. B. | en_US |
dc.contributor.author | Ferraro, I. | en_US |
dc.contributor.author | Bernard, E. J. | en_US |
dc.contributor.author | Gallart, C. | en_US |
dc.contributor.author | FIORENTINO, Giuliana | en_US |
dc.contributor.author | Iannicola, G. | en_US |
dc.contributor.author | Udalski, A. | en_US |
dc.date.accessioned | 2020-08-04T10:32:07Z | - |
dc.date.available | 2020-08-04T10:32:07Z | - |
dc.date.issued | 2015 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26687 | - |
dc.description | We are very grateful to our referee, Mario Mateo, for his useful comments and suggestions that helped to improve the readability and the content of this paper. We thank S. Cassisi for providing interesting and helpful discussions about the evolution of the stars in the horizontal branch. CEMV thanks V. F. Braga for helping us with the theoretical relations, and is grateful to the Rome Observatory and the Physics Department of the Tor Vergata University where most of this work has been realized. This research has been supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under the grant (project reference AYA2014–56795). The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to AU. GF has been supported by the Futuro in Ricerca 2013 (grant RBFR13J716). | en_US |
dc.description.abstract | We identified and characterized the largest (536) RR Lyrae (RRL) sample in a Milky Way dSph satellite (Sculptor) based on optical photometry data collected over ̃24 years. The RRLs display a spread in V-magnitude (̃0.35 mag) which appears larger than photometric errors and the horizontal branch (HB) luminosity evolution of a mono-metallic population. Using several calibrations of two different reddening free and metal independent period-Wesenheit relations we provide a new distance estimate μ = 19.62 mag (σ<SUB>μ</SUB> = 0.04 mag) that agrees well with literature estimates. We constrained the metallicity distribution of the old population, using the M<SUB>I</SUB> period-luminosity relation, and we found that it ranges from -2.3 to -1.5 dex. The current estimate is narrower than suggested by low and intermediate spectroscopy of RGBs (∆ [Fe/H]≤ 1.5). We also investigated the HB morphology as a function of the galactocentric distance. The HB in the innermost regions is dominated by red HB stars and by RRLs, consistent with a more metal-rich population, while in the outermost regions it is dominated by blue HB stars and RRLs typical of a metal-poor population. Our results suggest that fast chemical evolution occurred in Sculptor, and that the radial gradients were in place at an early epoch. | en_US |
dc.language.iso | eng | en_US |
dc.title | Variable stars in Local Group Galaxies - I. Tracing the early chemical enrichment and radial gradients in the Sculptor dSph with RR Lyrae stars | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stv2014 | en_US |
dc.identifier.scopus | 2-s2.0-84975774973 | en_US |
dc.identifier.isi | 000367997700024 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/454/2/1509/1049432 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 454 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 1509 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | ESP | en_US |
dc.contributor.country | CAN | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | en_US |
dc.identifier.adsbibcode | 2015MNRAS.454.1509M | 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.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.orcid | 0000-0003-0376-6928 | - |
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