Table 3: Best fit model parameters for $\delta$ Cep and its CSE. $\theta _\star$ is the stellar angular diameter (mas), $\alpha$ the CLD coefficient, $\theta _{\rm s}$ the shell angular diameter (mas), w the shell width (mas) and $F_{\rm s}/F_\star$ the relative brightness (Fig. 3). Last column tabulates the reduced $\chi ^2$ . Only parameters with error bars (lower scripts) have been fitted. Note that in the second line, $\theta _{\rm s}/\theta _\star$ , $\alpha$ , w and $F_{\rm s}/F_\star$ , are set to the values found for Polaris (see Table 2).
$\theta _\star$ $\alpha$ $\theta _{\rm s}$ w $F_{\rm s}/F_\star$ $\chi ^2$

$1.480_{\pm0.002}$ 0.16 - - - 1.9

$1.476_{\pm0.003}$ 0.16 3.54 0.5 1.5% 1.1

**Table 3:** Best fit model parameters for $\delta$ Cep and its CSE. $\theta _\star$ is the stellar angular diameter (mas), $\alpha$ the CLD coefficient, $\theta _{\rm s}$ the shell angular diameter (mas), w the shell width (mas) and $F_{\rm s}/F_\star$ the relative brightness (Fig. 3). Last column tabulates the reduced $\chi ^2$ . Only parameters with error bars (lower scripts) have been fitted. Note that in the second line, $\theta _{\rm s}/\theta _\star$ , $\alpha$ , w and $F_{\rm s}/F_\star$ , are set to the values found for Polaris (see Table 2).
$\theta _\star$	$\alpha$	$\theta _{\rm s}$	w	$F_{\rm s}/F_\star$	$\chi ^2$
$1.480_{\pm0.002}$	0.16	-	-	-	1.9
$1.476_{\pm0.003}$	0.16	3.54	0.5	1.5%	1.1

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