EDP Sciences
Free access
Volume 380, Number 1, December II 2001
Page(s) 300 - 308
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20011490

A&A 380, 300-308 (2001)
DOI: 10.1051/0004-6361:20011490

Abundances of recently discovered planetary nebulae towards the galactic bulge

A. V. Escudero and R. D. D. Costa

Departamento de Astronomia, IAG/USP, CP 3386, 01060-970 São Paulo, Brasil
    e-mail: escudero@iagusp.usp.br; 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 -- galactic bulge -- techniques: spectroscopic

Offprint request: R. D. D. Costa, roberto@iagusp.usp.br

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