Artículo
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge
Fernández Trincado, José G.; Beers, Timothy; Minniti, Dante; Carigi, Leticia; Placco, Vinivius M.; Chun, Sang Hyun; Lane, Richard R.; Geisler, Doug; Villanova, Sandro; Souza, Stefano O.; Barbuy, Beatriz; Pérez Villegas, Angeles; Chiappini, Cristina; Queiroz, Anna B. A.; Tang, Baitian; Alonso García, Javier; Piatti, Andres Eduardo
; Palma, Tali
; Alves Brito, Alan; Moni Bidin, Christian; Roman Lopes, Alexandre; Muñoz, Richard R.; Singh, Harinder P.; Kundu, Richa; Chaves Velasquez, Leonardo; Romero Colmenares, María; Longa Peña, Penelope; Soto, Mario; Vieira, Katherine
Fecha de publicación:
03/2021
Editorial:
EDP Sciences
Revista:
Astronomy and Astrophysics
ISSN:
0004-6361
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 (12C14N). 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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Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos(ICB)
Articulos de INSTITUTO INTERDISCIPLINARIO DE CIENCIAS BASICAS
Articulos de INSTITUTO INTERDISCIPLINARIO DE CIENCIAS BASICAS
Citación
Fernández Trincado, José G.; Beers, Timothy; Minniti, Dante; Carigi, Leticia; Placco, Vinivius M.; et al.; APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge; EDP Sciences; Astronomy and Astrophysics; 647; 64; 3-2021; 1-17
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