Chemical abundances in the metal-intermediate GC NGC 6723
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/198763 |
Resumo: | We have performed a detailed spectral analysis of the inner halo Galactic globular cluster (GC) NGC 6723 using high-resolution (R≈ 22 000–48 000) spectra for for 11 red giant branch stars collected with MIKE (Magellan) and FEROS (MPG/ESO). This globular is located at the minimum of the bimodal metallicity distribution of GCs, which suggests that it might be an excellent transitional system between metal-intermediate and metal-rich GCs. In spite of its metal-intermediate status, it is characterized by an extended horizontal branch and by a large number of RR Lyrae stars. We investigated abundances of a variety of species, including light, α-, Fe-peak, and neutron-capture elements. We found a mean metallicity [Fe/H]=−0.93±0.05 dex and typical α-enrichment ([α/Fe]≈0.39) that follows the trend of metal-poor and metal-intermediate GCs. The same outcome applies for light metals (Na, Al), Fe-peak (V, Cr, Mn, Fe, Co, Ni, Cu) and s/r-process elements (Ba, Eu), and for the classical anticorrelation: Na–O and Mg–Al. The current findings further support the evidence that the chemical enrichment of NGC 6723 is more in line with metal-intermediate GCs and their lower metallicity counterparts, and it does not bring forward the prodrome of the metal-rich regime |
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Souza, Juliana Crestani Ribeiro deAlves-Brito, AlanBono, GiuseppePuls, Arthur AlencastroAlonso Garcia, Javier2019-09-04T02:34:58Z20190035-8711http://hdl.handle.net/10183/198763001099043We have performed a detailed spectral analysis of the inner halo Galactic globular cluster (GC) NGC 6723 using high-resolution (R≈ 22 000–48 000) spectra for for 11 red giant branch stars collected with MIKE (Magellan) and FEROS (MPG/ESO). This globular is located at the minimum of the bimodal metallicity distribution of GCs, which suggests that it might be an excellent transitional system between metal-intermediate and metal-rich GCs. In spite of its metal-intermediate status, it is characterized by an extended horizontal branch and by a large number of RR Lyrae stars. We investigated abundances of a variety of species, including light, α-, Fe-peak, and neutron-capture elements. We found a mean metallicity [Fe/H]=−0.93±0.05 dex and typical α-enrichment ([α/Fe]≈0.39) that follows the trend of metal-poor and metal-intermediate GCs. The same outcome applies for light metals (Na, Al), Fe-peak (V, Cr, Mn, Fe, Co, Ni, Cu) and s/r-process elements (Ba, Eu), and for the classical anticorrelation: Na–O and Mg–Al. The current findings further support the evidence that the chemical enrichment of NGC 6723 is more in line with metal-intermediate GCs and their lower metallicity counterparts, and it does not bring forward the prodrome of the metal-rich regimeapplication/pdfengMonthly notices of the royal astronomical society. Oxford. Vol. 487, no. 4 (Aug. 2019), p. 5463-5474MetaisAglomerados de galaxiasAglomerados estelares globularesEstrelasstars: abundancesGalaxy: abundancesglobular clusters: individual: NGC 6723Chemical abundances in the metal-intermediate GC NGC 6723Estrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001099043.pdf.txt001099043.pdf.txtExtracted Texttext/plain63992http://www.lume.ufrgs.br/bitstream/10183/198763/2/001099043.pdf.txt3215038c31d5302179a2465a45dbac4aMD52ORIGINAL001099043.pdfTexto completo (inglês)application/pdf2108927http://www.lume.ufrgs.br/bitstream/10183/198763/1/001099043.pdf646a99dbb96b0cb07316659931162bdaMD5110183/1987632023-05-14 03:24:09.957305oai:www.lume.ufrgs.br:10183/198763Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-05-14T06:24:09Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Chemical abundances in the metal-intermediate GC NGC 6723 |
title |
Chemical abundances in the metal-intermediate GC NGC 6723 |
spellingShingle |
Chemical abundances in the metal-intermediate GC NGC 6723 Souza, Juliana Crestani Ribeiro de Metais Aglomerados de galaxias Aglomerados estelares globulares Estrelas stars: abundances Galaxy: abundances globular clusters: individual: NGC 6723 |
title_short |
Chemical abundances in the metal-intermediate GC NGC 6723 |
title_full |
Chemical abundances in the metal-intermediate GC NGC 6723 |
title_fullStr |
Chemical abundances in the metal-intermediate GC NGC 6723 |
title_full_unstemmed |
Chemical abundances in the metal-intermediate GC NGC 6723 |
title_sort |
Chemical abundances in the metal-intermediate GC NGC 6723 |
author |
Souza, Juliana Crestani Ribeiro de |
author_facet |
Souza, Juliana Crestani Ribeiro de Alves-Brito, Alan Bono, Giuseppe Puls, Arthur Alencastro Alonso Garcia, Javier |
author_role |
author |
author2 |
Alves-Brito, Alan Bono, Giuseppe Puls, Arthur Alencastro Alonso Garcia, Javier |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Souza, Juliana Crestani Ribeiro de Alves-Brito, Alan Bono, Giuseppe Puls, Arthur Alencastro Alonso Garcia, Javier |
dc.subject.por.fl_str_mv |
Metais Aglomerados de galaxias Aglomerados estelares globulares Estrelas |
topic |
Metais Aglomerados de galaxias Aglomerados estelares globulares Estrelas stars: abundances Galaxy: abundances globular clusters: individual: NGC 6723 |
dc.subject.eng.fl_str_mv |
stars: abundances Galaxy: abundances globular clusters: individual: NGC 6723 |
description |
We have performed a detailed spectral analysis of the inner halo Galactic globular cluster (GC) NGC 6723 using high-resolution (R≈ 22 000–48 000) spectra for for 11 red giant branch stars collected with MIKE (Magellan) and FEROS (MPG/ESO). This globular is located at the minimum of the bimodal metallicity distribution of GCs, which suggests that it might be an excellent transitional system between metal-intermediate and metal-rich GCs. In spite of its metal-intermediate status, it is characterized by an extended horizontal branch and by a large number of RR Lyrae stars. We investigated abundances of a variety of species, including light, α-, Fe-peak, and neutron-capture elements. We found a mean metallicity [Fe/H]=−0.93±0.05 dex and typical α-enrichment ([α/Fe]≈0.39) that follows the trend of metal-poor and metal-intermediate GCs. The same outcome applies for light metals (Na, Al), Fe-peak (V, Cr, Mn, Fe, Co, Ni, Cu) and s/r-process elements (Ba, Eu), and for the classical anticorrelation: Na–O and Mg–Al. The current findings further support the evidence that the chemical enrichment of NGC 6723 is more in line with metal-intermediate GCs and their lower metallicity counterparts, and it does not bring forward the prodrome of the metal-rich regime |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-09-04T02:34:58Z |
dc.date.issued.fl_str_mv |
2019 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/198763 |
dc.identifier.issn.pt_BR.fl_str_mv |
0035-8711 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001099043 |
identifier_str_mv |
0035-8711 001099043 |
url |
http://hdl.handle.net/10183/198763 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the royal astronomical society. Oxford. Vol. 487, no. 4 (Aug. 2019), p. 5463-5474 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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Repositório Institucional da UFRGS |
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Repositório Institucional da UFRGS |
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