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Evidence against Anomalous Compositions for Giants in the Galactic Nuclear Star Cluster
Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, SE-22100 Lund, Sweden.
Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, SE-22100 Lund, Sweden.
Observatoire de la Côte d'Azur, CNRS UMR 7293, BP4229, Laboratoire Lagrange, F-06304 Nice Cedex 4, France.
Malmö University, Faculty of Technology and Society (TS), Department of Materials Science and Applied Mathematics (MTM). Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, SE-22100 Lund, Sweden.ORCID iD: 0000-0001-9853-2555
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2018 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 866, no 1Article in journal (Refereed) Published
Abstract [en]

Very strong Sc I lines have recently been found in cool M giants in the Nuclear Star Cluster (NSC) in the Galactic center. Interpreting these as anomalously high scandium abundances in the Galactic center would imply a unique enhancement signature and chemical evolution history for NSCs, and a potential test for models of chemical enrichment in these objects. We present high resolution K-band spectra (NIRSPEC/Keck II) of cool M giants situated in the solar neighborhood and compare them with spectra of M giants in the NSC. We clearly identify strong Sc I lines in our solar neighborhood sample as well as in the NSC sample. The strong Sc I lines in M giants are therefore not unique to stars in the NSC and we argue that the strong lines are a property of the line formation process that currently escapes accurate theoretical modeling. We further conclude that for giant stars with effective temperatures below approximately 3800 K these Sc I lines should not be used for deriving the scandium abundances in any astrophysical environment until we better understand how these lines are formed. We also discuss the lines of vanadium, titanium, and yttrium identified in the spectra, which demonstrate a similar striking increase in strength below 3500 K effective temperature.

Place, publisher, year, edition, pages
Bibliopolis, Edizioni di Filosofia e Scienze, 2018. Vol. 866, no 1
Keywords [en]
Galaxy: center, stars: abundances, stars: late-type
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:mau:diva-15987DOI: 10.3847/1538-4357/aadb97ISI: 000446852900001Scopus ID: 2-s2.0-85055277235Local ID: 27264OAI: oai:DiVA.org:mau-15987DiVA, id: diva2:1419509
Available from: 2020-03-30 Created: 2020-03-30 Last updated: 2024-01-19Bibliographically approved

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Hartman, HenrikJönsson, Henrik

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