Matches in SemOpenAlex for { <https://semopenalex.org/work/W3205404979> ?p ?o ?g. }
- W3205404979 endingPage "A33" @default.
- W3205404979 startingPage "A33" @default.
- W3205404979 abstract "Lithium is one of the few elements produced during the Big Bang Nucleosynthesis in the early universe. Moreover, its fragility makes it useful as a proxy for stellar environmental conditions. As such, the lithium abundance in old systems is at the core of different astrophysical problems. Stars in the lower red giant branch allow studying globular clusters where main sequence stars are too faint to be observed. We use these stars to analyze the initial Li content of the clusters and compare it to cosmological predictions, to measure spreads in Li between different stellar populations, and to study signs of extra depletion in these giants. We use GIRAFFE spectra to measure the lithium and sodium abundances of lower red giant branch stars in 5 globular clusters. These cover an extensive range in metallicity, from [Fe/H]$sim-0.7$ to [Fe/H]$sim-2.3$ dex. We find that the lithium abundance in these lower red giant branch stars forms a plateau, with values from $mathrm{A(Li)_{NLTE}}=0.84$ to $1.03$ dex, showing no clear correlation with metallicity. When using stellar evolutionary models to calculate the primordial abundance of these clusters, we recover values $mathrm{A(Li)_{NLTE}}=2.1-2.3$ dex, consistent with the constant value observed in warm metal-poor halo stars, the Spite plateau. Additionally, we find no difference in the lithium abundance of first and second population stars in each cluster. We also report the discovery of a Li-rich giant in the cluster NGC3201, with $mathrm{A(Li)_{NLTE}}=1.63pm0.18$ dex, where the enrichment mechanism is probably pollution from external sources." @default.
- W3205404979 created "2021-10-25" @default.
- W3205404979 creator A5000983008 @default.
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- W3205404979 creator A5019507559 @default.
- W3205404979 creator A5059329144 @default.
- W3205404979 creator A5081644238 @default.
- W3205404979 date "2021-12-24" @default.
- W3205404979 modified "2023-10-14" @default.
- W3205404979 title "Lithium on the lower red giant branch of five Galactic globular clusters" @default.
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