APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge
dc.contributor.author | Fernández-Trincado, José Gregorio | pt_BR |
dc.contributor.author | Alves-Brito, Alan | pt_BR |
dc.contributor.author | Vieira, Katherine | pt_BR |
dc.date.accessioned | 2022-04-13T04:51:38Z | pt_BR |
dc.date.issued | 2021 | pt_BR |
dc.identifier.issn | 0004-6361 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/237159 | pt_BR |
dc.description.abstract | 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. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Astronomy and astrophysics. Les Ulis. Vol. 647 (Apr. 2021), A64, 15 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Bojos de galaxias | pt_BR |
dc.subject | Stars : Abundances | en |
dc.subject | Stars : Chemically peculiar | en |
dc.subject | Composicao estelar | pt_BR |
dc.subject | Globular clusters : Individual : NGC 6723 | en |
dc.subject | Aglomerados de galaxias | pt_BR |
dc.subject | Techniques : Spectroscopic | en |
dc.title | APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001139582 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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