| Texto completo | |
| Autor(es): |
Escudero‚ A. V.
;
Costa‚ R. D. D.
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Astronomy & Astrophysics; v. 380, n. 1, p. 300-308, Dez. 2001. |
| Área do conhecimento: | Ciências Exatas e da Terra - Astronomia |
| Assunto(s): | Galáxias Abundância estelar |
| Resumo | |
In this work we report spectrophotometric observations of a planetary nebula sample towards the galactic bulge. A total of 45 PNe was observed and their physical parameters (electron density and temperature) were derived. Ionic abundances were calculated using a three-level atom model and abundances were derived through ionisation correction factors. Results show low abundance objects at high galactic latitudes, indicating a possible vertical gradient inside the bulge. A few objects with low N/O ratio were found, which could have originated from old, low mass progenitors. (AU) | |
| Processo FAPESP: | 98/10138-8 - Espectroscopia de média e alta resolução: abundâncias químicas e populações estelares |
| Beneficiário: | Beatriz Leonor Silveira Barbuy |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |