\begin{table}%t6
\caption{ The 20 stars showing \ha excess. \label{Ha_stars}}
\small%\centerline
{
\begin{tabular}{lrlllclcc}
\hline\hline
\multicolumn{1}{c}{Active}       &  $V$ & Sp.type   &  \multicolumn{1}{c}{Inactive}  &   Sp.type. & \ha {\it EW}   & X-ray activity   & Note &\multicolumn{1}{c}{New/known}\\
\multicolumn{1}{c}{program star} &   &         & \multicolumn{1}{c}{comp. star} &             &  (\AA)  &                  & &\multicolumn{1}{c}{chromospheric emission}\\
\hline 
\object{HD~170493}      & 8.05 & K3V      & \object{HD~219134} &  K3V	          &	0.1	&                               &  &    new\\
\object{HD~175905}      & 7.66 & K0III    & \object{HD~188947} &  K0III	  &	0.2   &                                 &  &   new 	\\
\object{HD~168159}      & 9.29 & K3V      &  \object{HD~219134} &  K3V	  &	0.3	& log $\frac{L_{\rm X}}{L_{\rm bol}}=-3.91$& a  &   known \\
\object{HD~175545}      & 7.40 & K0III    & \object{HD~188947} &  K0III	  &	0.3   &                                 &&     new 	\\
\object{NGC 2264 VAS 10}  & 11.67 & K0IB     &  \object{HD~206778} &  K2Ib	  & 	0.3   &                                 &&     new 	\\
\object{NGC 6705 602}     & 11.46 & K0.5II   &  \object{HD~164349} &  K0.5II     & 	0.3	&                               &    &   new \\
\object{HD~178126}      & 9.22 & K3V      & \object{HD~219134} &  K3V	          & 	0.4   &                                 &&     new 	\\
\object{HD~262323}      & 8.75 &  K0Ibvar  &  \object{HD~206778} &  K2Ib	  &	0.4   &                                 &&     new\\
\object{HD~52919}       & 8.34 & K2V      &  \object{HD~4628}   &  K2V	  &	0.5	& log $\frac{L_{\rm X}}{L_{\rm bol}}=-3.78$&a   &   new\\
\object{HD~46122}       & 7.32 &  G6IV     &  \object{HD~190360} &  G6IV 	  &	0.7   & log $\frac{L_{\rm X}}{L_{\rm bol}}=-3.21$ & a  &  new \\
\object{HD~289114}      & 8.98 & K2V      &  \object{HD~4628}   &  K2V	  &	0.8	&                                &   &   known \\
\object{NGC 2264 VAS 92}  & 12.38 & G5V      &  \object{HD~190360} &  G6IV       & 	0.9	&  log $\frac{L_{\rm X}}{L_{\rm bol}}=-3.89$& b     &   new \\
\object{HD~51478}       & 8.08 & M3III    &  \object{HD~2411}   &  M3III	  &	3.0	&                                 &  &  known \\
\object{1E0650.4-0520}    & 12.60 & M2V      &  \object{HD~95735} &  M2V	  & 	3.1	&   log F$_{\rm X}=-1$3.57 (Wm$^{-2}$)  & b &  new\\
\object{HD~52690}       & 6.52 &  M3V      &  \object{HD~95735} &  M2V	  &	3.3	&                                 &  &   new \\
\object{1E0627.3-0245}    & 13.80 & M4III    &  \object{HD~130144} &  M5III	  &	6.6	& log F$_{\rm X}=-1$3.91 (Wm$^{-2}$)    & b &  new\\
\object{IP~Mon}           & 13.44 & K2V      &  \object{61 CygA}     &  K5V	  &	6.7	&  log $\frac{L_{\rm X}}{L_{\rm bol}}=-3.23$& b      &  known \\
\object{IO~Mon}           &  13.77 & K2V      &  \object{61 CygA}     &  K5V	  &	18.2	&  log $\frac{L_{\rm X}}{L_{\rm bol}}=-3.31$& b   &  known \\
\object{MM~Mon}  	 & 14.14 &  K7V     &  \object{61 CygA}     &  K5V	  &     29.8	&  log $\frac{L_{\rm X}}{L_{\rm bol}}=-2.79$& b       &  known \\
\object{MO~Mon}           & 13.65 & K7V      &  \object{61 CygA}     &  K5V	  &     42.7	&  log $\frac{L_{\rm X}}{L_{\rm bol}}=-3.10$ &b     &   known \\
\hline
\end{tabular}}
\smallskip
 a: From ROSAT-PSPC ; b: from XMM-Newton EPIC.
\end{table}