All Tables

Table 1: Objects selected for comparison with our hydrodynamical models. The effective temperatures of the central stars are from Méndez et al. (1992), and the spectroscopic expansion velocities from the decomposition of [O III] line profiles (Paper II, Table 4 therein).
Table 2: Expansion time scales from proper-motion measurements. The data are either from Palen et al. (2002), optical measurements, or from the compilation of Terzian (1997), radio measurements. The angular radii, $\theta _{\rm rim}$ , and their expansion rate, $\dot{\theta}_{\rm rim}$ , refer to the semi-minor axes. The effective temperatures are spectroscopic values (Méndez 1992) or He II Zanstra temperatures (Gorny, priv. comm.)