Abstract
We derive core masses and chemical compositions for luminous low-excitation planetary nebulae in the Magellanic Clouds. They are all on horizontal (heating) evolutionary tracks with core masses that concentrate between 0.55 and 0.6 M ⊙ , and have low He/H and N/O ratios as expected from the relation found by Kaler & Jacoby. The behavior of carbon with core mass is uncertain, but it seems consistent with the behavior of carbon stars. There is also a suggestion that C/O anticorrelates with N/O. Below 0.63 M ⊙ , O/H correlates positively with core mass.
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