| Full text | |
| Author(s): |
Escudero‚ A. V.
;
Costa‚ R. D. D.
Total Authors: 2
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 380, n. 1, p. 300-308, Dez. 2001. |
| Field of knowledge: | Physical Sciences and Mathematics - Astronomy |
| Abstract | |
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) | |