Fig. 9
Diagram of [s/Fe] versus [Fe/H]. The solid line is the mean ⟨ [s/Fe] ⟩ for field stars (Gratton & Sneden 1994; Ryan et al. 1996; and François et al. 2003). Green filled diamonds correspond to yellow-symbiotics, other symbols have the same meaning as in Fig. 8. For the CEMP-s stars, we show only those that have already been proven to be binary systems.
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