Table 4: Envelope morphology in light.

Star		 Env.a $\theta_{\rm env}$ $\tau_{\rm env}$ Corea $\tau_{\rm c}$
    $(\hbox{$^{\prime\prime}$ })$ (yr)   (yr)

IRC+10216		 C s 200 8700 Bp 50
IRC+10011 C s? 40 6800 Bp 75
CIT 6 ? s? 25b 3200b Bp 40
AFGL 2155 ? 18 5700 $\ldots$  
OH 348.2-19.7 C 28 12900 C  
AFGL 2514 E 40 7700 E  
AFGL 3068 Sp 42 15200 Sp  
AFGL 3099 ? 20 12200 $\ldots$  
AFGL 3116 ? 18 5600 $\ldots$  
a Morphology: C = circular, s = shells, E = elliptical,
Sp = spiral, Bp = bipolar. b Based on CO.


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