\begin{table}%t3
%\centering
\par
\caption{\label{param}Adopted parameters for a~Cen (HR 5378).}
 \small\begin{tabular}{lc}
  \hline  \hline\noalign{\smallskip}
  Parameter & Adopted value\\
  \hline   
  $T_{\rm eff}$                & 19~000 K \\
  $\log{g}$                 & 4.0 \\
  $v\sin{i}$                & 15.0 km~s$^{-1}$ \\
  Inclination $i$          & 70\degr \\
  Rotation period          & 8.817744 days \\
  Radial velocity       & $5.8 \pm 0.2$ km~s$^{-1}$\\
  Micro turbulence $\xi$   & 2.5 km~s$^{-1}$\\
  Macro turbulence         & 0.0 km~s$^{-1}$\\
  Radius                   & 2.8 solar\\
  \hline
 \end{tabular}
\end{table}