\begin{table}%t2
\caption{\label{tab:par}Orbital and atmospheric parameters of GD~687. } 
%\centerline
{\small
\begin{tabular}{ll}
\hline\hline
        Orbital parameters & \\
        $T_{\rm 0}$ [HJD]    & $2~455~144.515\pm0.002$ \\
        $P$                  & $0.37765\pm0.00002~{\rm d}$ \\
        $\gamma$             & $32.3\pm3.0~{\rm km~s^{-1}}$ \\
        $K$                  & $118.3\pm3.4~{\rm km~s^{-1}}$ \\
        $f(M)$               & $0.065\pm0.006~{M_{\odot}}$ \\
        \hline
        Atmospheric parameters & \\
        $T_{\rm eff}$        & $24350\pm360~{\rm K}$\dag \\
        $\log~g$             & $5.32\pm0.07~{\rm K}$\dag \\
        $v_{\rm rot}\sin{i}$ & $21.2\pm2.0~{\rm km~s^{-1}}$\\
        \hline
        Derived binary parameters & \\
        $M_{\rm 1}$ (adopted) & $0.47~{M_{\odot}}$ \\
        $R_{\rm 1}$           & $0.25\pm0.02~{R_{\odot}}$ \\
        $i$                   & $39.3^{+6.2}_{-5.6}~^{\circ}$ \\
        $M_{\rm 2}$           & $0.71_{-0.21}^{+0.22}~{M_{\odot}}$ \\
        $M_{\rm 1}+M_{\rm 2}$ & $1.18_{-0.21}^{+0.22}~{M_{\odot}}$ \\
        $t_{\rm merger}$      & $11.1\times10^{9}~{\rm yr}$\ddag \\
	\hline
\end{tabular}}
\tablefoot{\dag~Taken from Lisker et~al. (\cite{lisker}). 
\ddag~The merging time is calculated using the formula given in Ergma et~al. (\cite{ergma}).}
\end{table}