Zr and Sr correlate in the metal-poor giants which indicates a similar formation process of these two elements. This is in agreement with the findings of Farouqi et al. (2009) and Kratz et al. (2008b). At higher metallicities ([Sr/H] > −1) the formations of Sr and Zr differ. The upper limits are due to the before mentioned lacking visual spectra of the three stars (see text).
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