\begin{table}%t1
\caption{Theoretical binary systems.}\label{tab1}
%\centering
\par
\begin{tabular}{c c c c c}
\hline
\hline
Binary & $M_{\rm A}$ & $M_{\rm B}$ & $M_{\rm B}/M_{\rm A}$  &
$R_{\rm AB}$\\
system & [$M_{\odot}$] & [$M_{\odot}$] & \omit & [AU]\\
\hline
  1 & 1.25 & 0.75 & 0.60 & 15\\      
  2 & 1.25 & 0.75 & 0.60 & 10\\      
  3 & 1.00 & 0.60 & 0.60 &  8\\      
  4 & 0.75 & 0.25 & 0.33 &  5\\      
\hline
\end{tabular}
\end{table}