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Fig. 10.

image

Blue symbols are the abundance ratios of the cumulative s- and/or i-process enrichment, i.e., [X/Ba]s/i, in the chemical evolution of Sculptor from [Fe/H] = −2 to −1. Different symbols are three independent methods to remove the r-process from the measured abundances: 1) Circles assume the r-process pattern from Bisterzo et al. (2014); 2) Squares adopt the pattern of the strongly r-process enhanced star CS 22892-052 from Sneden et al. (2003); 3) Triangles assume that any increase of [X/Mg] with [Fe/H] in Sculptor comes only from the s-process (see text for details). Errors include measurement errors in Sculptor and the errors from Bisterzo et al. (2014). The abundance range of Milky Way CEMP-s stars with a undiluted s-process signature, [Eu/Ba] <  −0.9, is shown with a light gray bar, and a dark gray bar is the same for CEMP-i stars with −0.5 ≤ [Eu/Ba] ≤ 0, [Ba/Fe] >  1, and [Eu/Fe] >  1. The range of all available s-process models for AGB stars in the F.R.U.I.T.Y database are shown for two metallicities: Z = 10−4 (dark orange); and Z = 10−3 (light orange). Yellow is the range of abundance ratios for nonstandard s-process in massive stars, 10 − 150 M with Z = 10−3 (Choplin et al. 2018). The range of the pure i-process at Z = 10−4 is in green, where light green refers to n-densities of 1012nd/cm−3 ≤ 1014, and dark green assumes higher 1012 < nd/cm−3 ≤ 1015 (Hampel et al. 2016). CEMP-s references: Aoki et al. (2002), Cohen et al. (2013), Roederer et al. (2014); CEMP-i references: Aoki et al. (2002), Goswami et al. (2006), Behara et al. (2010), Cohen et al. (2013), Cui et al. (2013), Hansen et al. (2015), Hampel et al. (2019) (which includes the sample from Abate et al. 2015b).

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