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- Title
Aluminium-enriched metal-poor stars buried in the inner Galaxy.
- Authors
Fernández-Trincado, José G.; Beers, Timothy C.; Minniti, Dante; Tang, Baitian; Villanova, Sandro; Geisler, Doug; Pérez-Villegas, Angeles; Vieira, Katherine
- Abstract
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] ≲ −0.7) stars with stellar atmospheres strongly enriched in aluminium (Al-rich stars: [Al/Fe] ≳ +0.5), well above the typical Galactic levels, located within the solar radius toward the bulge region, which lies in highly eccentric orbits (e ≳ 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.
- Subjects
STELLAR atmospheres; GLOBULAR clusters; STARS; MILKY Way; GALACTIC bulges; CHEMICAL species; CHEMICAL plants
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2020, Vol 643, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/202039207