\begin{table}%T1
%\centering
\small
\caption{ $uvby${$\beta$} indices obtained for HD~239276 during the 
1986$-$87 run and comparison with those available in the bibliography for 
HR~8799. Sources: 1)~present work; 2) Shuster \& Nissen (\cite{Shuster86}); 3) Zerbi et~al. (\cite{Zerbi99}).\label{t1}}
\begin{tabular}{crrrrc}  \hline\hline
Star & $b-y$~ & $m_1$~ & $c_1$~ & $\beta$~~ & Source \\ 
~    & (mag)& (mag)  & (mag)  & (mag)     & ~     \\ \hline
HD~239276&  0.201&  0.132&  0.673&  2.730&  1 \\
HR~8799  &  0.188&  0.137&  0.689&  2.742&  2 \\
HR~8799  &  0.181&  0.142&  0.678&  2.745&  3 \\ \hline
\end{tabular}
\end{table}