\begin{table}%t1
\small
\caption{JCMT/SCUBA wide photometry at 850~$\mu$m.}\label{tab1}
%\centerline
{\begin{tabular}{llcclclccccc} 
\hline\hline\noalign{\smallskip}
   Star    &   Sp.     &    RA$^a$   &   Dec$^a$  &  Dist.     & Log~($L_{x}$)$^b$ &   Moving      &  Integration &  Flux density          & Size $^c$ &   Dust    &   Dust      \\
           &   type    &    (J2000)  &   (J2000)  &   (pc)     & Log~(erg/s)     &   Group        &  time        &  (mJy)                 &  (AU)     & temp$^d$  &  mass$^e$   \\
           &           &             &            &            &                 &                & (h)        &                        &           &   (K)     &   (moon)   \\
\hline 
 GJ~82      &   M4      &  01 59 23.5 &  58 31 16  &   12.0     &   28.75         &   Loc Ass.     &   2          &    $2.0  \pm 1.4$      &   84      &  16       &   $<$1.3  \\
 GJ~212     &   M0.5    &  05 41 30.7 &  53 29 20  &   12.5     &  28.57          &  Loc Ass.      &   2          &    $1.3  \pm 1.4$      &   88      &  23       &   $<$0.8  \\
 GJ~285     &   M4.5    &  07 44 40.1 &  03 33 08  &   5.9      &  28.62          & Loc Ass.       &   1          &    --$0.7 \pm 1.9$      &   41      &  20       &   $<$0.3  \\
 GJ~393     &   M2      &  10 28 55.5 &  00 50 27  &   7.2      &  26.84          & Loc Ass.       &   1          &    $1.9  \pm 1.9$      &   50      &  26       &   $<$0.3  \\
 GJ~507.1   &   M1.5    &  13 19 40.1 &  33 20 47  &   17.4     &  n/a            & Loc Ass.       &   1          &    --$0.4 \pm 2.0$      &  121      &  19       &   $<$2.8  \\
 GJ~696     &   M0      &  17 50 34.0 & --06 03 01  &   21.9     &  n/a            & Loc Ass.       &   2          &     $0.8 \pm 0.8$       &  150      &  20       &   $<$1.9  \\
 GJ~9809    &   M0      &  23 06 04.8 &  63 55 34  &   24.9     &  29.43          & Loc Ass.       &   1          &   --$5.2  \pm 2.3$      &  174      &  18       &   $<$7.6  \\
 GJ~4247    &   M4      &  22 01 13.2 &  28 18 25  &    9.0     &  n/a            & Castor         &   1          &    $1.1  \pm 2.1$      &   63      &  18       &   $<$0.9  \\
 GJ~277B    &   M3.5    &  07 31 57.3 &  36 13 47  &   11.5     &  29.05          & Castor         &   1          &   --$2.1  \pm 1.8$      &   80      &  17       &   $<$1.3  \\
 GJ~842.2   &   M0.5    &  21 58 24.8 &  75 35 21  &   20.9     &  n/a            & Castor         &   4          &    {$25  \pm 4.6^f$} &  300      &   13      &   $28 \pm 5$   \\
 GJ~890     &   M2      &  23 08 19.5 & --15 24 35  &   21.9     &  29.22          &  Castor        &   2          &    --$2.6 \pm 1.6$      &  153      &  16       &   $<$4.5  \\
 GJ~875.1   &   M3      &  22 51 53.7 &  31 45 15  &   14.2     &  28.92          & IC2391         &   1          &    $0.52 \pm 2.1$      &   99      &  17       &   $<$2.4  \\
\hline
\end{tabular}}
\smallskip
 $^a$  Observed positions,  i.e. coordinates updated with the Hipparcos proper motions at the mean observation date of September 2004.\\   
 $^b$  ROSAT All Sky Survey of Nearby Stars: Huensch et~al. (1999). \\  
 $^c$  Size is the radius of a debris disk as large as the telescope beam ($14''$).\\   
 $^d$  Temperature is computed at this radius. \\    
 $^e$  Mass upper limits are based on the $3\sigma$ flux densities (see text).\\  
 $^f$  Total flux density of the extended emission and the South-West peak.  
\end{table}