| Issue |
A&A
Volume 380, Number 1, December II 2001
|
|
|---|---|---|
| Page(s) | 300 - 308 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20011490 | |
| Published online | 15 December 2001 | |
Abundances of recently discovered planetary nebulae towards the galactic bulge *,**
Departamento de Astronomia, IAG/USP, CP 3386, 01060-970 São Paulo, Brasil e-mail: escudero@iagusp.usp.br; roberto@iagusp.usp.br
Corresponding author: R. D. D. Costa, roberto@iagusp.usp.br
Received:
30
April
2001
Accepted:
24
September
2001
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.
Key words: ISM: planetary nebulae: general / Galaxy: bulge / techniques: spectroscopic
© ESO, 2001
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