Submitted:
03 March 2026
Posted:
04 March 2026
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Abstract
CEMP-rs stars are often interpreted as signatures of intermediate (i-) process nucleosynthesis during early AGB evolution, yet no observed pattern has been shown to favor the i-process over a simple r+s combination. We present a new analysis of TYC 6044-714-1 based on high-resolution UVES spectra and state-of-the-art 1D and 3D non-LTE modelling, deriving precise atmospheric parameters, elemental abundances, and barium isotopic ratios. Modelling of the Ba II 4934 Å line indicates that 86% of barium originates from the s-process, while the derived [Ba/Eu] = 0.25 dex further supports s-process dominance.
Keywords:
CEMP-s stars
; CEMP-rs stars
; s-process
; i-process
; high-resolution spectroscopy
; abundances
; isotope ratios
; nucleosynthesis
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