Table 5: Adopted and derived modelling parameters of the two PPNe.
IRAS No. D L $f_{{\rm CO}}$ $\dot{M}$ $v_{{\rm exp}}$ $R_{\rm e}$ h 12CO/13CO
  [kpc] [$L_{\odot}$]   [$M_{\odot }$ yr-1] [km s-1] [cm]    
16594-4656 1.80a 4900 $1\times 10^{-3}$ $1\times 10^{-5}$ 14.0 $2.9\times10^{17}$ 10.0 30
17150-3224 2.42b 11 000 $2\times10^{-4}$ $3\times 10^{-5}$ 14.5 $2.4\times 10^{17}$ 1.8 7
$\textstyle \parbox{13.5cm}{ $^a$\space \citet{VDV_etal1989}.\\ $^b$\space \citet{Bujarrabal_etal2001}.}$


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Article Contents
1 Introduction
2 Observations
3 Sources
4 CO observations
5 CO line modelling
6 Molecular evolution
7 Discussion
8 Conclusions
References
Online Material
Appendix A: Molecular line spectra
List of tables
List of figures