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Astron. Astrophys. 353, 543-556 (2000)


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Observations of planetary nebulae in the Galactic Bulge *

F. Cuisinier 1, W.J. Maciel 2, J. Köppen 3, A. Acker 4 and B. Stenholm 5

1 Observatorio do Valongo, Deptartamento de Astronomia, UFRJ, Ladeira do Pedro Antonio 43, 20080 - 090 Rio de Janeiro RJ, Brazil
2 Instituto Astronômico e Geofisico da USP, Deptartamento de Astronomia, CP 9638, 01065 - 970 São Paulo SP, Brazil
3 Institut für theoretische Physik und Astrophysik der Universität zu Kiel, 24098 Kiel, Germany
4 Observatoire de Strasbourg, 11 rue de l' Université, 67000 Strasbourg, France
5 Lund Observatory, Box 43, 221 00 Lund, Sweden

Received 8 June 1999 / Accepted 30 September 1999

Abstract

High quality spectrophotometric observations of 30 Planetary Nebulae in the Galactic Bulge have been made. Accurate reddenings, plasma parameters, and abundances of He, O, N, S, Ar, Cl are derived.

We find the abundances of O, S, Ar in the Planetary Nebulae in the Galactic Bulge to be comparable with the abundances of the Planetary Nebulae in the Disk, high abundances being maybe slightly more frequent in the Bulge.

The distribution of the N/O ratio does not present in the Galactic Bulge Planetary Nebulae the extension to high values that it presents in the Disk Planetary Nebulae. We interpret this as a signature of the greater age of Bulge Planetary Nebulae.

We thus find the Bulge Planetary Nebulae to be an old population, slightly more metal-rich than the Disk Planetary Nebulae. The population of the Bulge Planetary Nebulae shows hence the same characteristics than the Bulge stellar population.

Key words: ISM: planetary nebulae: general – Galaxy: abundances – Galaxy: center

* based on observations made at ESO, La Silla, Chile

Send offprint requests to: F. Cuisinier (cuisinie@sun1.ov.ufrj.br)

© European Southern Observatory (ESO) 2000

Online publication: December 17, 1999

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