In several companion papers, we shall exploit the spectroscopic observations of planetary nebulae in M 32 and in the bulge of M 31 in several ways. First, we intend to study the evolution of the planetary nebulae in these galaxies relative to those in the Milky Way and the Magellanic Clouds. We also intend to investigate the chemical evolution of M 32 and the bulges of M 31 and the Milky Way individually as well as the chemical evolution of DHGs as a class.
Acknowledgements
We would like to thank George Jacoby for making several very helpful comments concerning a preliminary version of this paper, and for making further helpful suggestions as referee. MGR would like to thank the Natural Sciences and Engineering Research Council of Canada and Marshall McCall for their financial support while this research was being done. MGR also thanks the Physics and Astronomy Department at York University for its hospitality and computing facilities while this work was being finished. MLM thanks the Natural Sciences and Engineering Research Council of Canada for its continuing support.
Copyright The European Southern Observatory (ESO)