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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Aluminium-enriched metal-poor stars buried in the inner Galaxy

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Autor(es):
Fernandez-Trincado, Jose G. [1, 2] ; Beers, Timothy C. [3, 4] ; Minniti, Dante [5, 6] ; Tang, Baitian [7] ; Villanova, Sandro [8] ; Geisler, Doug [8, 9, 10] ; Perez-Villegas, Angeles [11] ; Vieira, Katherine [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
Mostrar menos -
[1] Univ Atacama, Inst Astron & Ciencias Planetarias, Copayapu 485, Copiapo - Chile
[2] Univ Bourgogne Franche Comte, OSU THETA Franche Comte, Observ Besancon, Inst Utinam, CNRS, UMR 6213, BP 1615, F-251010 Besancon - France
[3] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 - USA
[4] Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 - USA
[5] Vatican Observ, I-00120 Vatican City - Vatican
[6] Univ Andres Bello, Fac Ciencias Exactas, Dept Cs Fis, Av Fernandez Concha 700, Santiago - Chile
[7] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082 - Peoples R China
[8] Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion - Chile
[9] Univ La Serena, Dept Astron, Ave Juan Cisternas 1200, La Serena - Chile
[10] Univ La Serena, Inst Invest Multidisciplinario Ciencia & Tecnol, Benavente 980, La Serena - Chile
[11] Univ Sao Paulo, IAG, Rua Matao 1226, BR-05508900 Sao Paulo - Brazil
Número total de Afiliações: 11
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 643, OCT 27 2020.
Citações Web of Science: 0
Resumo

Stars with higher levels of aluminium and nitrogen enrichment are often key pieces in the chemical makeup of multiple populations in almost all globular clusters (GCs). There is also compelling observational evidence that some Galactic components could be partially built from dissipated GCs. The identification of such stars among metal-poor field stars may therefore provide insight into the composite nature of the Milky Way (MW) bulge and inner stellar halo, and could also reveal other chemical peculiarities. Here, based on APOGEE spectra, we report the discovery of 29 mildly metal-poor ({[}Fe/H] less than or similar to -0.7) stars with stellar atmospheres strongly enriched in aluminium (Al-rich stars: {[}Al/Fe] greater than or similar to +0.5), well above the typical Galactic levels, located within the solar radius toward the bulge region, which lies in highly eccentric orbits (e greater than or similar to 0.6). We find many similarities for almost all of the chemical species measured in this work with the chemical patterns of GCs, and therefore we propose that they have likely been dynamically ejected into the bulge and inner halo from GCs formed in situ and/or GCs formed in different progenitors of known merger events experienced by the MW, such as the Gaia-Sausage-Enceladus and/or Sequoia. (AU)

Processo FAPESP: 17/15893-1 - Órbitas de aglomerados globulares do bojo: formação e evolução da Via Láctea
Beneficiário:Maria de Los Angeles Perez Villegas
Linha de fomento: Bolsas no Brasil - Pós-Doutorado