\begin{table}%t8
\caption{\label{tab:mass}The evaluation of the mass of the invisible companion of every programme star.}
%\centering
\small
\begin{tabular}{lll} 
\hline\hline 
Star  & \multicolumn{2}{c}{Mass of the companion in solar mass.} \\
      & $i$ = 90$^{\circ}$   &   $i$ = 65$^{\circ}$      \\  
      \hline
\nulacht  &  0.29  &  0.33 \\
\hd       &  0.13  &  0.15 \\
\entra    &  1.25  &  1.50 \\ 
\eenvijf\  &  0.41  &  0.47 \\
\eennegen &  0.49  &  0.56 \\
\eennegenb & 0.13 & 0.15 \\ 
\hline
\end{tabular}
\end{table}