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Fig. 15.

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Correlations of Th and Eu and their relationship. Left panel: Pearson and Spearman correlation coefficients for Th and Eu in stars with [Fe/H] ≤ −2 as a function of [Eu/Th]. At [Eu/Th] ≃ 0 they start diverging in a moderate way, separating two subgroups (actinide-boost and -normal stars). The positions of three typical stars CS31082−001 (complete, r-II, actinide boost), HD 115444 (complete, r-I, actinide boost), CS22892−052 (complete, r-II), and TYC5329-1927-1 (complete, r-I) are indicated. While the extreme cases CS31082−001 and TYC5329-1927-1 link the actinide-boost and normal behavior to r-II versus r-I stars, this is less clear closer to the dividing line [Eu/Th] = 0. Right panel: Th versus Eu abundances in the two subgroups (actinide-boost and actinide normal) of stars with [Fe/H] ≤ −2 and corresponding linear fits.

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