Left panel: element abundance pattern of HE 2252−4225. The filled rhombi, open circles, and filled circles display abundances derived from lines of molecules, neutral species, and singly ionised species, respectively. An upper limit for the Pb abundance is indicated by downward-facing triangle. The dotted line indicates the star’s iron abundance [ Fe/H ] = − 2.63. Right panel: abundance patterns of HE 2252−4225 (filled circles) and HE 2327−5642 (open rhombi) in the C-Zn range compared with the yields of single supernova of 14.4 M⊙ (continuous line) as given by Lai et al. (2008) and the chemical evolution predictions of Kobayashi et al. (2011, dotted line). The first model provides [(C+N)/Fe]. The corresponding value was plotted for HE 2327−5642, but not HE 2252−4225, where the uncertainty in derived N abundance is large.
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