Third-dredge-up oxygen in planetary nebulae?
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2000
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| _version_ | 1876472661709684736 |
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| author | D. Péquignot |
| author_facet | D. Péquignot |
| contents | Third-dredge-up oxygen in planetary nebulae? D. Péquignot A. A. Zijlstra J. Walsh G. Dudziak Física, Astronomía y Matemáticas 436 AGB PLAN 423) WRAY 16 The two planetary nebulae (PNe) Wray 16{423 and He 2{436 belong to thenewly recognized Sagittarius dwarf galaxy and appear as nearly twin events. Carbonis more abundant in He 2{436, conrming that the amount of third-dredge-upmaterial may be di erent in two otherwise similar objects. The high degree ofhomogeneity of all available data sets and adopted procedures, the common originof these PNe, their large and di erent C overabundances, and nally the lowinitial abundances of their parent stars provide favorable circumstances to studyby-products of the third dredge-up. Extensive photoionization modeling stronglysuggests that, assuming identical sulfur abundances, oxygen is more abundant inHe 2{436 than in Wray 16{423, thus possibly disclosing for the rst time thirddredge-up oxygen. If C is mainly in gaseous form, the increment ratio by number isO/C = 0:07 within a factor of 2. Argon is roughly constant whereas neon maymoderately increase together with C and O. An open question is the relationshipbetween the excess of nitrogen and the lesser overabundance of C in Wray 16{423. 2000 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57100954 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.9 |
| format | Artículo científico |
| id | redalyc_57100954 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Third-dredge-up oxygen in planetary nebulae? D. Péquignot Física, Astronomía y Matemáticas 436 AGB PLAN 423) WRAY 16 Third-dredge-up oxygen in planetary nebulae? D. Péquignot A. A. Zijlstra J. Walsh G. Dudziak Física, Astronomía y Matemáticas 436 AGB PLAN 423) WRAY 16 The two planetary nebulae (PNe) Wray 16{423 and He 2{436 belong to thenewly recognized Sagittarius dwarf galaxy and appear as nearly twin events. Carbonis more abundant in He 2{436, conrming that the amount of third-dredge-upmaterial may be di erent in two otherwise similar objects. The high degree ofhomogeneity of all available data sets and adopted procedures, the common originof these PNe, their large and di erent C overabundances, and nally the lowinitial abundances of their parent stars provide favorable circumstances to studyby-products of the third dredge-up. Extensive photoionization modeling stronglysuggests that, assuming identical sulfur abundances, oxygen is more abundant inHe 2{436 than in Wray 16{423, thus possibly disclosing for the rst time thirddredge-up oxygen. If C is mainly in gaseous form, the increment ratio by number isO/C = 0:07 within a factor of 2. Argon is roughly constant whereas neon maymoderately increase together with C and O. An open question is the relationshipbetween the excess of nitrogen and the lesser overabundance of C in Wray 16{423. 2000 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57100954 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.9 |
| title | Third-dredge-up oxygen in planetary nebulae? |
| topic | Física, Astronomía y Matemáticas 436 AGB PLAN 423) WRAY 16 |
| url | https://www.redalyc.org/articulo.oa?id=57100954 |