\begin{table}%t2
 \caption{\label{tab2}Parameters and results for the binary system + uniform disk circumstellar envelope obtained for $\delta$~Cen. Note that there is a 180$^\circ$ ambiguity in the position angle since the AMBER closure phase data reduction process is not fully validated.}
 \small%\centering
\par
\begin{tabular}{cc}
\hline\hline
Distance & 121 $\pm$ 11 pc\\
$T_{\rm eff}$& 21~000 $\pm$ 1000 K\\
Stellar radius & 5.9 $\pm$ 0.5 $R_{\odot}$\\
$\log g$ & 3.75 $\pm$ 0.25\\
\hline\noalign{\smallskip}
Companion flux ($K$ band) & 0.07 $\pm$ 0.0.1 $F_{\rm tot}$\\
Separation & 68.7 $\pm$ 0.5 mas\\
Position Angle (PA) & 117.5 $\pm$ 0.5$\degr$\\
Envelope flux ($K$ band) & 0.52 $\pm$ 0.06  $F_{\rm tot}$\\
Envelope diameter ($K$ band) & 1.6 $\pm$ 0.4 mas\\
\hline
\end{tabular}  
\end{table}