Fig. 12
Relative abundances log(O/N) × log(C/N) for several classes of stars. Results for type I PNe (black filled triangles), type II PNe (green asterisks), cool post-AGB stars (blue open circles), Galactic carbon stars (blue filled stars) can be compared to the hot post-AGB stars analysed in this work (red filled circles). The solid line indicates C/O = 1.
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