Chemical composition of globular cluster and halo post-agb stars
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2002
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| _version_ | 1876470632310374400 |
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| author | C. J. Mooney |
| author_facet | C. J. Mooney |
| contents | Chemical composition of globular cluster and halo post-agb stars C. J. Mooney L. H. Aller W. R. J. Rolleston P. L. Dufton F. P. Keenan J. V. Smoker D. L. Pollacco Física, Astronomía y Matemáticas AGB TYPE STARS: EARLY STARS: ABUNDANCES STARS: AGB AND POST We present results of model atmosphere analyses of two post-AGB stars, ZNG-1 in the globular cluster M10 andthe halo star PG1704+222. A di erential abundance analysis reveals typical post-AGB abundance patterns,both stars being generally metal poor with approximately solar He. Large C depletions, observed in all hotpost-AGB objects, are conrmed. The C deciency may suggest that hot post-AGB stars evolve o the AGBbefore the third dredge-up begins. However, Fe depletions observed in other similar stars suggest that gas-dustfractionation in the AGB progenitor is responsible for the observed composition of these objects. 2002 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57112076 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.12 |
| format | Artículo científico |
| id | redalyc_57112076 |
| institution | Redalyc |
| language | en |
| publishDate | 2002 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Chemical composition of globular cluster and halo post-agb stars C. J. Mooney Física, Astronomía y Matemáticas AGB TYPE STARS: EARLY STARS: ABUNDANCES STARS: AGB AND POST Chemical composition of globular cluster and halo post-agb stars C. J. Mooney L. H. Aller W. R. J. Rolleston P. L. Dufton F. P. Keenan J. V. Smoker D. L. Pollacco Física, Astronomía y Matemáticas AGB TYPE STARS: EARLY STARS: ABUNDANCES STARS: AGB AND POST We present results of model atmosphere analyses of two post-AGB stars, ZNG-1 in the globular cluster M10 andthe halo star PG1704+222. A di erential abundance analysis reveals typical post-AGB abundance patterns,both stars being generally metal poor with approximately solar He. Large C depletions, observed in all hotpost-AGB objects, are conrmed. The C deciency may suggest that hot post-AGB stars evolve o the AGBbefore the third dredge-up begins. However, Fe depletions observed in other similar stars suggest that gas-dustfractionation in the AGB progenitor is responsible for the observed composition of these objects. 2002 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57112076 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.12 |
| title | Chemical composition of globular cluster and halo post-agb stars |
| topic | Física, Astronomía y Matemáticas AGB TYPE STARS: EARLY STARS: ABUNDANCES STARS: AGB AND POST |
| url | https://www.redalyc.org/articulo.oa?id=57112076 |