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APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge

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العنوان: APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge
المؤلفون: 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
بيانات النشر: EDP Sciences
المجموعة: CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
مصطلحات موضوعية: GLOBULAR CLUSTERS: INDIVIDUAL: NGC 6723, STARS: ABUNDANCES, STARS: CHEMICALLY PECULIAR, TECHNIQUES: SPECTROSCOPIC, https://purl.org/becyt/ford/1.7Test, https://purl.org/becyt/ford/1Test
الوصف: 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. ; Fil: Fernández Trincado, José G. Universidad de Atacama.; Chile. Universite de Franche-Comte; Francia. University of Notre Dame; Estados Unidos ; Fil: Beers, Timothy. University of Notre Dame; Estados Unidos ; Fil: Minniti, Dante. Universidad Andrés Bello; Chile. Vatican Observatory; Ciudad del Vaticano ; Fil: Carigi, Leticia. Universidad Nacional Autónoma de México; México ; Fil: Placco, Vinivius M. NSF’s National Optical-Infrared Astronomy Research Laboratory; Estados Unidos ; Fil: Chun, Sang Hyun. Korea Astronomy And Space Science Institute; Corea del Sur ; Fil: Lane, Richard R. Universidad de Atacama.; Chile ; Fil: Geisler, Doug. Universidad ...
نوع الوثيقة: article in journal/newspaper
وصف الملف: application/pdf
اللغة: English
تدمد: 0004-6361
العلاقة: info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2021/03/aa40255-20/aa40255-20.htmlTest; http://hdl.handle.net/11336/167086Test; 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; CONICET Digital; CONICET
الإتاحة: https://doi.org/10.1051/0004-6361/202040255Test
http://hdl.handle.net/11336/167086Test
حقوق: info:eu-repo/semantics/restrictedAccess ; https://creativecommons.org/licenses/by-nc-sa/2.5/arTest/
رقم الانضمام: edsbas.3EB96EB1
قاعدة البيانات: BASE
الوصف
تدمد:00046361