APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/237159 |
Resumo: | The central (‘bulge’) region of the Milky Way is teeming with a significant fraction of mildly metal-deficient stars with atmospheres that are strongly enriched in cyanogen (12C 14N). Some of these objects, which are also known as nitrogen-enhanced stars, are hypothesised to be relics of the ancient assembly history of the Milky Way. Although the chemical similarity of nitrogen-enhanced stars to the unique chemical patterns observed in globular clusters has been observed, a direct connection between field stars and globular clusters has not yet been proven. In this work, we report on high-resolution, near-infrared spectroscopic observations of the bulge globular cluster NGC 6723, and the serendipitous discovery of a star, 2M18594405−3651518, located outside the cluster (near the tidal radius) but moving on a similar orbit, providing the first clear piece of evidence of a star that was very likely once a cluster member and has recently been ejected. Its nitrogen abundance ratio ([N/Fe] & +0.94) is well above the typical Galactic field-star levels, and it exhibits noticeable enrichment in the heavy s-process elements (Ce, Nd, and Yb), along with moderate carbon enrichment; all characteristics are known examples in globular clusters. This result suggests that some of the nitrogen-enhanced stars in the bulge likely originated from the tidal disruption of globular clusters. |
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Fernández-Trincado, José GregorioAlves-Brito, AlanVieira, Katherine2022-04-13T04:51:38Z20210004-6361http://hdl.handle.net/10183/237159001139582The central (‘bulge’) region of the Milky Way is teeming with a significant fraction of mildly metal-deficient stars with atmospheres that are strongly enriched in cyanogen (12C 14N). Some of these objects, which are also known as nitrogen-enhanced stars, are hypothesised to be relics of the ancient assembly history of the Milky Way. Although the chemical similarity of nitrogen-enhanced stars to the unique chemical patterns observed in globular clusters has been observed, a direct connection between field stars and globular clusters has not yet been proven. In this work, we report on high-resolution, near-infrared spectroscopic observations of the bulge globular cluster NGC 6723, and the serendipitous discovery of a star, 2M18594405−3651518, located outside the cluster (near the tidal radius) but moving on a similar orbit, providing the first clear piece of evidence of a star that was very likely once a cluster member and has recently been ejected. Its nitrogen abundance ratio ([N/Fe] & +0.94) is well above the typical Galactic field-star levels, and it exhibits noticeable enrichment in the heavy s-process elements (Ce, Nd, and Yb), along with moderate carbon enrichment; all characteristics are known examples in globular clusters. This result suggests that some of the nitrogen-enhanced stars in the bulge likely originated from the tidal disruption of globular clusters.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 647 (Apr. 2021), A64, 15 p.Bojos de galaxiasComposicao estelarAglomerados de galaxiasStars : AbundancesStars : Chemically peculiarGlobular clusters : Individual : NGC 6723Techniques : SpectroscopicAPOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulgeEstrangeiroinfo: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:UFRGSTEXT001139582.pdf.txt001139582.pdf.txtExtracted Texttext/plain81777http://www.lume.ufrgs.br/bitstream/10183/237159/2/001139582.pdf.txtf1f4c3a478629d2a2ceb1cb5cc19fa87MD52ORIGINAL001139582.pdfTexto completo (inglês)application/pdf3819705http://www.lume.ufrgs.br/bitstream/10183/237159/1/001139582.pdf981cc08071f652a1b6c472f2e90524e6MD5110183/2371592023-05-14 03:24:34.774738oai:www.lume.ufrgs.br:10183/237159Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-05-14T06:24:34Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge |
title |
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge |
spellingShingle |
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge Fernández-Trincado, José Gregorio Bojos de galaxias Composicao estelar Aglomerados de galaxias Stars : Abundances Stars : Chemically peculiar Globular clusters : Individual : NGC 6723 Techniques : Spectroscopic |
title_short |
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge |
title_full |
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge |
title_fullStr |
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge |
title_full_unstemmed |
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge |
title_sort |
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge |
author |
Fernández-Trincado, José Gregorio |
author_facet |
Fernández-Trincado, José Gregorio Alves-Brito, Alan Vieira, Katherine |
author_role |
author |
author2 |
Alves-Brito, Alan Vieira, Katherine |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Fernández-Trincado, José Gregorio Alves-Brito, Alan Vieira, Katherine |
dc.subject.por.fl_str_mv |
Bojos de galaxias Composicao estelar Aglomerados de galaxias |
topic |
Bojos de galaxias Composicao estelar Aglomerados de galaxias Stars : Abundances Stars : Chemically peculiar Globular clusters : Individual : NGC 6723 Techniques : Spectroscopic |
dc.subject.eng.fl_str_mv |
Stars : Abundances Stars : Chemically peculiar Globular clusters : Individual : NGC 6723 Techniques : Spectroscopic |
description |
The central (‘bulge’) region of the Milky Way is teeming with a significant fraction of mildly metal-deficient stars with atmospheres that are strongly enriched in cyanogen (12C 14N). Some of these objects, which are also known as nitrogen-enhanced stars, are hypothesised to be relics of the ancient assembly history of the Milky Way. Although the chemical similarity of nitrogen-enhanced stars to the unique chemical patterns observed in globular clusters has been observed, a direct connection between field stars and globular clusters has not yet been proven. In this work, we report on high-resolution, near-infrared spectroscopic observations of the bulge globular cluster NGC 6723, and the serendipitous discovery of a star, 2M18594405−3651518, located outside the cluster (near the tidal radius) but moving on a similar orbit, providing the first clear piece of evidence of a star that was very likely once a cluster member and has recently been ejected. Its nitrogen abundance ratio ([N/Fe] & +0.94) is well above the typical Galactic field-star levels, and it exhibits noticeable enrichment in the heavy s-process elements (Ce, Nd, and Yb), along with moderate carbon enrichment; all characteristics are known examples in globular clusters. This result suggests that some of the nitrogen-enhanced stars in the bulge likely originated from the tidal disruption of globular clusters. |
publishDate |
2021 |
dc.date.issued.fl_str_mv |
2021 |
dc.date.accessioned.fl_str_mv |
2022-04-13T04:51:38Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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article |
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http://hdl.handle.net/10183/237159 |
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0004-6361 |
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001139582 |
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0004-6361 001139582 |
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http://hdl.handle.net/10183/237159 |
dc.language.iso.fl_str_mv |
eng |
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eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Les Ulis. Vol. 647 (Apr. 2021), A64, 15 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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