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Fig. 4


[Eu/Ba] and [Sr/Ba] vs. [Ba/Fe] for the stars studied from the LP First Stars and the stars studied by Siqueira Mello et al. (2014) and Siqueira-Mello et al. (2015). The open triangles represent the turn-off stars and the open squares the giants. The big square symbols indicate the 11 giants studied here and the number given at the centre of the squares in panel B refers to the identification of the star in Tables 2 and 3 (with higher numbers for higher [Sr/Ba]). CS 31082-001 (red filled star symbol) and HD 122563 (red open star symbol) are the =reference stars. CS 22949-037 (blue open diamond, only on panel B) is a peculiar C-rich metal-poor giant. In panels A and B a red dashed line is drawn at [Ba/Fe] = 0.0; in panel A the dotted line represents the mean LTE value of [Eu/Ba] in VMP stars (close to a pure r process value as observed in CS 31082-001) and in panel B the minimum of [Sr/Ba] close to a pure r-process production as observed in CS 31082-001. The dash-dotted line in panel B indicates the upper limit of [Sr/Ba].

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