Spectrophotometric observations of planetary nebulae high above the Galactic plane
F.Cuisinier, A.Acker, J.Köppen
ABSTRACT Spectrohotometric observations at high signal-to-noise ratio for a sample of 62 planetary nebulae are presented, together with the plasma and abundance analyses. The objects were selected homogeneously from the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae by their height above the disk (over 300 pc) and their Hbeta surface brightness (between 1E-12 and 1E-14 mW/m^2/arcsec^2). The abundances of O, S, Ar, and Cl are tighly correlated. The N/O ratio shows a wide range of values, independent of He or O abundance.