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Table 5:

Parameters for the best-fit model to the observed 12CO and 13CO line profiles.
  $R_{{\rm i}}$ $R_{{\rm out}}$ Mass-loss late $f_{{\rm CO}}$ $V_{{\rm exp}}$ T0 $\alpha$ $T_{{\rm bg}}$
  (1014 cm) (1014 cm) (${M_{\odot}}$ yr-1) (10-4) (km s-1) (K)   (K)
$^{{\rm 12}}$CO 1 630 4.7 $\times$ 10-6 3 18 40 0.8 2.7
$^{{\rm 13}}$CO 1 700 4.7 $\times$ 10-6 0.35 18 50 0.8 2.7

Notes. $R_{{\rm i}}$ represents the inner radius of the envelope, $R_{{\rm out}}$the outer radius and $f_{{\rm CO}}$ = [CO/H2] the CO abundance relative to H2. The last three columns give the values for the parameters in Eq. (5). The expansion velocity is derived from the 12CO(3-2) observations.

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