\begin{table}%t4
\caption{Stellar parameters adopted in this work and resulting 8 and 12~$\mu$m envelope flux.  \label{Fenv}}
\par
%\centering
\par
 \begin{tabular}{c|ccccc|cc}
 \hline\hline
& \multicolumn{5}{c|}{ Adopted stellar parameters}&\multicolumn{2}{c}{$F_{\rm e}$ ($\%$)}\\
Name& $T_{\rm eff}$ (K)& log $g$  &$R_{\rm \star}$ ($R_{\rm \odot}$)& $d$ (pc) & $A_{\rm v}$ & 8~$\mu$m &12~$\mu$m\\
\hline
$\kappa$ CMa& 24~600&4.07&5.9 &202&0.37 &$90\pm6$&$94\pm4$\\
$\delta$ Cen& 22~360&3.92&6.5 &127&0.10 &$88\pm5$&$93\pm3$\\
$\alpha$ Ara& 18~044&3.99&4.5 &81 &0.10 &$87\pm4$&$91\pm3$\\
p Car       & 17~389&3.52&6.0 &148&0.05 &$87\pm4$&$91\pm3$\\
$\zeta$ Tau & 19~340&3.52&7.5 &136&0.30 &$80\pm6$&$86\pm5$\\
$\alpha$ Col& 12~963&3.73&5.8 &80 &0.00 &$67\pm11$&$76\pm8$\\
$\beta$ CMi & 11~772&3.51&3.5 &49 &0.00 &$59\pm13$&$69\pm10$\\
\hline
\end{tabular}
\end{table}