\begin{table}%t1
 \caption{\label{tab:stellprop}Stellar properties of Cha~H$\alpha$~objects.}
\small
%\centering
\par
\begin{tabular}{cccccccc}
\hline\hline
&\multicolumn{7}{c}{\citet{Luhman04}}  \\
& & & &\multicolumn{2}{c}{\citet{Burrows97}}&\multicolumn{2}{c}{\citet{Baraffe98}}\\
\par
Object & Sp. type& $T_{\rm eff}$ (K) &$\log(L/L_\odot)$& Age  & Mass & Age  & Mass   \\
 & & (K)& & (Myr) &($M_\odot$) & (Myr) &($M_\odot$) \\
\hline
Cha~H$\alpha$~2 & M 5.25 & 3091 & --0.92 & $<$3  & 0.2           & $<$2 & $>$0.1 \\
Cha~H$\alpha$~3 & M 5.5  & 3058 & --1.11 & $<$3  & $0.1<M<0.2$ & $<$2 & $>$0.1 \\
Cha~H$\alpha$~4 & M 5.5  & 3058 & --1.17 &$3<a<10$&$0.1<M<0.2$& 2     &$0.1<M<0.2$ \\
Cha~H$\alpha$~5 & M 5.5  & 3058 & --1.00 & $<$3  & $0.1<M<0.2$ & $<$2 &  $>$0.1\\
Cha~H$\alpha$~6 & M 5.75 & 3024 & --1.13 & $3<a<10$   & $0.1<M<0.2$ & $<$2 & $>$0.1 \\
Cha~H$\alpha$~8 & M 5.75 & 3024 & --1.35 & $3<a<10$   & $0.1<M<0.2$ & $2<a<5$ & $>$0.1 \\
\hline
\hline
&\multicolumn{7}{c}{\citet{Comeron00}}\\
& & & &\multicolumn{2}{c}{\citet{Burrows97}}&\multicolumn{2}{c}{\citet{Baraffe98}}\\
Object& Sp. Type&$T_{\rm eff}$ & $\log(L/L_\odot)$& Age  & Mass & Age  & Mass \\
 & & (K)& & (Myr) &($M_\odot$) & (Myr) &($M_\odot$) \\
\hline
Cha~H$\alpha$~2 &  M 6.5 & 2910 & --1.47 & 4.5 & 0.08 & 2    & 0.07 \\
Cha~H$\alpha$~3 &   M 7  & 2840 & --1.46 & 2   & 0.07 & $<$2 & 0.06  \\
Cha~H$\alpha$~4 &  M 6   &2980  & --1.25 & 3.5 & 0.11 & 2    & 0.1  \\
Cha~H$\alpha$~5 &  M 6   & 2980 & --1.31 & 3.5 & 0.11 & 2    & 0.1  \\
Cha~H$\alpha$~6 &  M 7   & 2840 & --1.57 & 4   & 0.07 & $<$2 & 0.05 \\
Cha~H$\alpha$~8 &  M 6.5 & 2910 & --1.65 & 5.5 & 0.08 & 3    & 0.07 \\
\hline
\hline
&\multicolumn{7}{c}{\citet{Comeron99}}\\
& & & & \multicolumn{2}{c}{\citet{Burrows97}} & \multicolumn{2}{c}{\citet{D'Antona97}}\\
Object& Sp. type&$T_{\rm eff}$ (K) & $\log(L(L_\odot))$& age (Myr) & mass ($M_\odot$)& age (Myr) & mass ($M_\odot$)\\
\hline
Cha~H$\alpha$~2 &  M 6 & 2831 & --1.16 & 0.4 & 0.08  & 1   & 0.10\\
Cha~H$\alpha$~3 &  M 6 & 2824 & --1.27 & 0.5 & 0.075 & 1.5 & 0.09\\
Cha~H$\alpha$~4 &  M 6.5&2781 & --1.31 & 0.5 & 0.065 & 1   & 0.08 \\
Cha~H$\alpha$~5 &  M 6 & 2816 & --1.06 & 0.4 & 0.09  & 0.5 & 0.10\\
Cha~H$\alpha$~6 &  M6  & 2815 & --1.57 & 2   & 0.06  & 3   & 0.08\\
Cha~H$\alpha$~8 &  --  & --   & --    & --  &  --   & --  & --\\
\hline
\end{tabular}
\end{table}