Table 3: Nebular abundances for the very high mass CSPN of the PHM sample.
PN He/H N/O $\log({\rm O/H})+12$
IC 4593 0.099 0.047 8.50
NGC 6826 0.107 0.10 8.46
IC 418 0.086 0.13 8.76
Hen 2-131   0.38 8.67
Hen 2-108a >0.117 0.28 8.40
IC 1266b 0.074 0.09 8.71
type I 0.137 0.85 8.66
type II-III 0.103 0.26 8.66

a Torres-Peimbert & Peimbert (1977); b Phillips (2003).


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