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Article Contents
1 Introduction
2 Source sample
3 New CO observations
4 Calculation of physical parameters from the CO data
5 Mass, momentum and energy carried by PPN outflows
6 Characteristic duration of the strong mass acceleration
7 Gas acceleration due to radiation pressure in late AGB stars and PPNe
8 Mass and dynamics of PPNe: Statistical results
9 Other mechanisms for the acceleration of the nebular material
10 Conclusions

Copyright ESO 2001
Published by EDP Sciences