\begin{table}%t3
\caption{\label{tab3}Basic stellar parameters of Arcturus.}
%\centerline
 {\small \begin{tabular}{ll}
\hline \hline
Parameter &    Value    \\
\hline
angular diameter &  $ 21.05 \pm 0.21 $ (mas)$^{a}$   \\
effective temperature, $T_{\rm eff}$  & 4300 $\pm$ 30~K$^{b}$     \\
      surface gravity (log $g$) & $ 1.5 \pm  0.15$ $^{b}$  \\
      ${\rm [Fe/H] }$  & --0.5 $\pm$ 0.1$^{~b}$       \\
      parallax &  $ 88.85 \pm 0.74 $ (mas)$^{~c}$      \\
      radius, $R_{*}$    &  25.5~$ R_{\odot} \pm 1.5$ $^{d}$\\
      mass, $M_{*}$    &  $ 0.75~M_{\odot} \pm 0.2^{e}$    \\
      micro turbulent velocity, $\xi_{\rm micro}$ &1.85~km~s$^{-1}$ $^{f}$\\
      radial velocity (heliocentric) &  --5.5~km~s$^{-1}$ $^{g}$  \\
\hline
\end{tabular}}
\medskip
$^{{a}}$  Lacour et~al. (\cite{Lacour08});  $^{{b}}$~Peterson et~al. (\cite{Peterson93}); $^{{c}}$~Hipparcos data (ESA~1997); $^{{d}}$  based on the angular diameter and parallax; $^{{e}}$  based on the radius and log~$g$; $^f$~based on our preliminary analysis (our final value is 1.87~km~s$^{-1}$);  $^{{g}}$  Griffin \& Griffin (\cite{Griffin73}).
\end{table}