Galactic ArchaeoLogIcaL ExcavatiOns (GALILEO)

نویسندگان

چکیده

(ABRIDGED) We use the 17th data release of second phase Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) to provide a homogenous census N-rich red giant stars across Milky Way (MW). report total 149 newly identified field giants toward bulge, metal-poor disk, and halo our Galaxy. They exhibit significant enrichment in their nitrogen abundance ratios ([N/Fe] $\gtrsim+0.5$), along with simultaneous depletions [C/Fe] ([C/Fe] $< +0.15$), they cover wide range metallicities ($-1.8 < $ [Fe/H] <-0.7$). The final sample candidate globular-cluster-like (GC-like) patterns from APOGEE survey includes grand $\sim$ 412 unique objects. These strongly N-enhanced are speculated have been stripped GCs based on chemical similarities these systems. Even though we not found any strong evidence for binary companions or signatures pulsating variability yet, cannot rule out possibility that some objects were members systems past and/or currently part variable system. In particular, fact identify such among Galaxy provides nucleosynthetic process(es) producing anomalous [N/Fe] occurs over metallicities. This may either against uniqueness progenitor existence anomalies associated likely tidally shredded clusters massive dwarf galaxies as "Kraken/Koala," \textit{Gaia}-Enceladus-Sausage, others, before during accretion by MW. A dynamical analysis reveals characteristics throughout MW, ...

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ژورنال

عنوان ژورنال: Astronomy and Astrophysics

سال: 2022

ISSN: ['0004-6361', '1432-0746']

DOI: https://doi.org/10.1051/0004-6361/202243195