\begin{table}%t8
\caption {\label{cemp_class}Classification of CEMP stars based on abundances of neutron-capture
  elements.  }
  \vspace*{-1mm}
%\centerline
 {\begin{tabular}{lll}
\hline\hline
\noalign{\smallskip}
Class       & Definition & Reference  \\
\hline
CEMP-no &  $\rm [Ba/Fe]< 0.0$       & S2006  \\
CEMP-no/s &  $+0.5<\rm [Ba/Fe]< +1.0$       & S2006 \\
CEMP-s &  $\rm [Ba/Fe]> +1.0$ and $\rm [Ba/Eu]>+0.5$       & S2006 \\
CEMP-s &  $\rm [Ba/Fe]> +1.0$ and $\rm [Ba/Eu]>+0.0$ & J2006 \\
       &  \& $\rm [Eu/Fe] <+1.0$                & \\  
CEMP-r/s &  $0.0<\rm [Ba/Fe]< +0.5$        & S2006 \\
CEMP-r+s &    [Ba/Fe]~$>$~1.0 and [Eu/Fe]~$>$~1.0      & J2006 \\
\hline
\end{tabular}}
\vspace*{-1.5mm}
\tablefoot{S2006 and J2006 refer to Sivarani et~al.~(2006) and Jonsell et~al.~(2006), respectively.}
\end{table}