Table 5: Parameters adjusted for modelling (see Sect. 3.2). $T_\star$ : stellar temperature; $R_\star$ : stellar radius; $r_{\rm i}, r_{\rm o}$ : inner respectively outer radius of dust shell; $\tau _{11}$ : optical depth of shell at $11~{\rm\mu m}$ . In all cases, an accelerated dust density profile was used.
Object $T_\star$ $R_\star$ $r_{\rm i}/R_\star$ $r_{\rm o}/R_\star$ $\tau _{11}$

(K) (mas)

$\alpha$ Ori 3640 21.8 45.9 48.2 0.0065

SW Vir 2800 8.65 15.0 1000.0 0.045

R Leo 2500 14.9 3.5 140.0 0.1

**Table 5:** Parameters adjusted for modelling (see Sect. 3.2). $T_\star$ : stellar temperature; $R_\star$ : stellar radius; $r_{\rm i}, r_{\rm o}$ : inner respectively outer radius of dust shell; $\tau _{11}$ : optical depth of shell at $11~{\rm\mu m}$ . In all cases, an accelerated dust density profile was used.
Object	$T_\star$	$R_\star$	$r_{\rm i}/R_\star$	$r_{\rm o}/R_\star$	$\tau _{11}$
	(K)	(mas)
$\alpha$ Ori	3640	21.8	45.9	48.2	0.0065
SW Vir	2800	8.65	15.0	1000.0	0.045
R Leo	2500	14.9	3.5	140.0	0.1

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