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Fig. 13


Comparison of the mass distributions for 164 mild (Ba1 −Ba2) and 110 very mild (Ba0) barium stars (red and black curves, respectively) computed using evolutionary tracks with [Fe/H] = 0.25. Very mild barium stars are defined as having a Ba index smaller than 1 in the catalogue of Lü (1991). Upper panel: normalized histograms are shown. Lower panel: cumulative frequency distributions are shown with the maximum absolute difference between these distributions amounting to 0.168, corresponding to a first-kind error of 13% when rejecting the null hypothesis of identical distributions in a Kolmogorov-Smirnov test with an effective sample size of 48.2 [= 164 × 110/(164 + 110)].

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