Corpus ID: 17909603

Third-dredge-up oxygen in planetary nebulae

@article{Pquignot2000ThirddredgeupOI,
  title={Third-dredge-up oxygen in planetary nebulae},
  author={D. P{\'e}quignot and J. Walsh and A. Zijlstra and G. Dudziak},
  journal={Astronomy and Astrophysics},
  year={2000},
  volume={361}
}
The planetary nebulae He 2-436 and Wray 16-423 in the Sagittarius dwarf galaxy appear to result from nearly twin stars, except that third-dredge-up carbon is more abundant in He 2-436. A thorough photoionization-model analysis implies that ratios Ne/O, S/O and Ar/O are significantly smaller in He 2-436, indicative of third-dredge-up oxygen enrichment. The enrichment of oxygen with respect to carbon is (7±4)%. Excess nitrogen inWray 16-423 suggests third dredge-up of late-CN-cycle products even… Expand

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