Expansion velocities and dynamical ages of planetary nebulae

The [O III] expansion velocities are presented for planetary nebulae in the Galactic Bulge and Halo, and in the Sagittarius Dwarf spheroidal galaxy. T he velocities are shown to increase with the distance from the star, in agr eement with hydrodynamical models. Dynamical ages are derived from these ve locities and are corrected for the effects of post-ACE acceleration and non -uniform velocities. Masses for the central stars are obtained from relatio ns between dynamical ages and stellar temperatures. The stellar core mass d istribution is narrow, peaking at 0.61 M-.. This is higher than predicted f or the Bulge by initial-final mass relations, but consistent with the local white dwarf mass distribution.