Optical spectroscopy of Magellanic Cloud planetary nebulae. III

Abstract

We present optical spectroscopy in the range 3300-7800 A for a total of 37 planetary nebulae in the LMC and seven in the SMC. Together with the objects from the first paper in this series, we now have accurate emission-line intensities down to a few percent ofH/1 for 77 nebulae in the Magellanic Clouds. Agreement with other authors is excellent. Reddening estimates from Balmer line ratios have been determined, and the line intensities have been dereddened accordingly. Nebular [0 m] electron temperatures, and where measurable [S II] densities, are derived. [0 II] electron densities are recalculated using appropriate electron temperatures. The [S II] and [0 II] electron densities correlate well, with ne([O II])> ne([S n]). Zanstra temperatures are derived for 22 objects possessing detectable stellar continua. These temperatures are in agreement with photoionization modeling of this sample.