Third-dredge-up oxygen in planetary nebulae

Details Third-dredge-up oxygen in planetary nebulae Third-dredge-up oxygen in planetary nebulae

2000-08-29

arxiv.org/abs/astro-ph/0008443v1

Astronomy and Astrophysics

Astrophysics

To appear in Astron. Astrophys. Lett. (Latex, 5 pages, 1 postscript figure)

Scientific paper

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 in Wray 16-423 suggests third dredge-up of late CN-cycle products even in these low-mass, intermediate-metallicity stars.

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