Physical parameters and chemical composition in abell 78
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2000
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| author | Miriam Peña |
| author_facet | Miriam Peña |
| contents | Physical parameters and chemical composition in abell 78 Miriam Peña Selene Medina Física, Astronomía y Matemáticas AGB VIDUAL (A 78) ISM: ABUNDANCES STARS: AGB AND POST PLANETARY NEBULAE: INDI Physical parameters and chemical abundances were derived for di erent zonesof A78, from a high resolution spectroscopic study. The zones observed are thebright central knots and the outer hydrogen-rich shell. The knots contain an extremelyhydrogen-decient material and the composition of this zone is dominatedby helium and heavy elements. The hydrogen-rich external shell appears to havenormal helium abundance and very low metallicity. We conclude that the abundancedetermination is a ected by the presence of large temperature uctuations inthe gas, due to additional heating mechanisms such as shocks by high speed ejectaand photoelectrons from dust grains. 2000 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57100960 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_57100960 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Physical parameters and chemical composition in abell 78 Miriam Peña Física, Astronomía y Matemáticas AGB VIDUAL (A 78) ISM: ABUNDANCES STARS: AGB AND POST PLANETARY NEBULAE: INDI Physical parameters and chemical composition in abell 78 Miriam Peña Selene Medina Física, Astronomía y Matemáticas AGB VIDUAL (A 78) ISM: ABUNDANCES STARS: AGB AND POST PLANETARY NEBULAE: INDI Physical parameters and chemical abundances were derived for di erent zonesof A78, from a high resolution spectroscopic study. The zones observed are thebright central knots and the outer hydrogen-rich shell. The knots contain an extremelyhydrogen-decient material and the composition of this zone is dominatedby helium and heavy elements. The hydrogen-rich external shell appears to havenormal helium abundance and very low metallicity. We conclude that the abundancedetermination is a ected by the presence of large temperature uctuations inthe gas, due to additional heating mechanisms such as shocks by high speed ejectaand photoelectrons from dust grains. 2000 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57100960 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 | Physical parameters and chemical composition in abell 78 |
| topic | Física, Astronomía y Matemáticas AGB VIDUAL (A 78) ISM: ABUNDANCES STARS: AGB AND POST PLANETARY NEBULAE: INDI |
| url | https://www.redalyc.org/articulo.oa?id=57100960 |