Third-dredge-up oxygen in planetary nebulae

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dc.creatorPequignot, D.
dc.creatorWalsh, J. R.
dc.creatorZijlstra, A. A.
dc.creatorDudziak, G.
dc.date2000-08-29
dc.date.accessioned2026-07-07T01:55:09Z
dc.date.available2026-07-07T01:55:09Z
dc.descriptionThe 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.
dc.descriptionTo appear in Astron. Astrophys. Lett. (Latex, 5 pages, 1 postscript figure)
dc.identifierhttps://arxiv.org/abs/astro-ph/0008443
dc.identifierhttp://arxiv.org/abs/astro-ph/0008443
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1555
dc.subjectAstrophysics
dc.titleThird-dredge-up oxygen in planetary nebulae
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