\begin{table}%t1
%\centering
\par
\caption{X-ray detected Praesepe members. $\Delta r$ is the distance to the
optical position. The column labeled "set'' indicates whether the source
was detected on the summed dataset (S) or only on the MOS (M) or PN (P)
single datasets. Count rates are MOS equivalent count rates, except where
set = P, when they are PN count rates. Luminosities were derived using the
appropriate conversion factors (see text).}
\begin{tabular}{lcccrcrrrlll}
\hline\hline
\noalign{\smallskip}
Name& RA$_{\rm X}$& DEC$_{\rm X}$& $\Delta r$& ML& set& count rate& 
$L_{\rm X}$ &$V$& $B-V$& Mem& Notes \\
& \multicolumn{2}{c}{(J2000)}& ($\>\arcsec\>$)& & & (cts/ksec)& ($a$)& &
$(R-I)_{\rm c}$\hskip -3pt *& & ($b$)\\
\hline
\noalign{\smallskip}
KW 154  & $8\>39\>09.24$& $19\>35\>32.5$& 2.02&    39.5& S& 
  $ 0.71 \pm 0.14$&   1.87&  8.50& 0.25 & Y &         \\
KW 155  & $8\>39\>10.20$& $19\>40\>45.1$& 2.73&    24.8& S& 
  $ 0.70 \pm 0.17$&   1.87&  9.42& 0.41 & Y &         \\
KW 181  & $8\>39\>25.05$& $19\>27\>35.2$& 1.64&  8056.9& S& 
  $17.45 \pm 0.43$&  46.28& 10.47& 0.59 & Y & SB, X   \\
KW 184  & $8\>39\>28.66$& $19\>28\>26.5$& 1.56&   280.2& S& 
  $ 1.68 \pm 0.16$&   4.45& 11.56& 0.90 & Y & SB2, X  \\
KW 198  & $8\>39\>38.42$& $19\>26\>28.5$& 1.57&   229.5& S& 
  $ 1.33 \pm 0.13$&   3.53& 12.59& 0.96 & Y &         \\
KW 208  & $8\>39\>46.00$& $19\>22\>01.5$& 3.22&  1139.7& S& 
  $ 8.06 \pm 0.44$&  21.38& 10.66& 0.58 & Y &         \\
KW 212  & $8\>39\>50.76$& $19\>32\>27.2$& 0.68& 15189.1& S& 
  $17.37 \pm 0.33$&  46.08&  6.59& 0.96 & Y & K0III, X\\
KW 213  & $8\>39\>50.91$& $19\>33\>02.9$& 1.10&   212.0& S& 
  $ 1.20 \pm 0.12$&   3.18& 11.81& 0.80 & Y & X       \\
KW 217  & $8\>39\>52.45$& $19\>18\>45.7$& 1.83&  1399.0& S& 
  $ 9.13 \pm 0.49$&  24.22& 10.23& 0.51 & Y & X       \\
KW 224  & $8\>39\>56.54$& $19\>33\>11.3$& 0.98& 53890.7& S& 
  $45.14 \pm 0.50$& 119.73&  7.32& 0.19 & Y & SB1, X  \\
KW 236  & $8\>39\>59.99$& $19\>33\>59.9$& 1.50&   145.5& S& 
  $ 0.74 \pm 0.09$&   1.96& 11.94& 1.00 & Y & SB, X   \\
KW 237  & $8\>40\>00.05$& $19\>34\>41.8$& 1.48&    99.2& S& 
  $ 0.63 \pm 0.09$&   1.67& 12.86& 1.00 & Y & X       \\
KW 246  & $8\>40\>03.95$& $19\>47\>06.2$& 4.42&    17.9& M& 
  $ 3.49 \pm 1.05$&   9.25& 12.01& 0.84 & Y?& SB1     \\
KW 250  & $8\>40\>04.94$& $19\>43\>46.2$& 0.78&   173.0& S& 
  $ 1.57 \pm 0.17$&   4.16&  9.79& 0.47 & Y &         \\
KW 257  & $8\>40\>06.30$& $19\>18\>27.1$& 1.70&   211.9& S& 
  $ 3.27 \pm 0.35$&   8.67& 11.00& 0.77 & Y & SB, PhB \\
KW 263  & $8\>40\>09.68$& $19\>37\>18.3$& 1.51&   348.1& S& 
  $ 1.61 \pm 0.13$&   4.28& 12.02& 0.81 & Y & X       \\
KW 268  & $8\>40\>12.35$& $19\>38\>22.3$& 0.90&  1191.2& S& 
  $ 3.70 \pm 0.19$&   9.83&  9.89& 0.48 & Y & SB1     \\
KW 279  & $8\>40\>20.72$& $19\>41\>12.3$& 0.37&   525.7& S& 
  $ 3.52 \pm 0.26$&   9.35&  7.70& 0.20 & Y & SB1     \\
KW 283  & $8\>40\>22.13$& $19\>40\>11.5$& 0.66&  1335.6& S& 
  $ 5.18 \pm 0.24$&  13.74&  6.44& 1.02 & Y & K0.5IIIa\\
KW 287  & $8\>40\>23.28$& $19\>40\>22.8$& 1.18&  2369.4& S& 
  $ 7.98 \pm 0.31$&  21.16& 10.37& 0.59 & Y & SB1     \\
KW 288  & $8\>40\>22.75$& $19\>27\>54.0$& 0.52&  1863.4& S& 
  $ 7.67 \pm 0.33$&  20.35& 10.71& 0.58 & Y & X       \\
KW 293  & $8\>40\>25.60$& $19\>28\>33.7$& 1.71&  1609.4& S& 
  $ 4.70 \pm 0.21$&  12.47&  9.89& 0.48 & Y & X       \\
KW 295  & $8\>40\>26.12$& $19\>41\>11.6$& 0.42&   227.1& S& 
  $ 1.84 \pm 0.18$&   4.87&  9.41& 0.41 & Y &         \\
KW 299  & $8\>40\>27.50$& $19\>39\>21.9$& 2.39&    45.1& S& 
  $ 0.54 \pm 0.10$&   1.44& 13.17& 1.07 & Y &         \\
KW 313  & $8\>40\>33.37$& $19\>38\>02.7$& 2.75&   196.5& S& 
  $ 1.71 \pm 0.19$&   4.54& 12.20& 0.89 & Y &         \\
KW 322  & $8\>40\>39.92$& $19\>40\>10.8$& 4.01&   685.4& S& 
  $ 4.15 \pm 0.28$&  11.01& 10.87& 0.68 & Y & SB1, X  \\
KW 326  & $8\>40\>42.40$& $19\>33\>59.7$& 2.86&   133.1& S& 
  $ 1.21 \pm 0.15$&   3.20& 11.34& 0.72 & Y &         \\
KW 334  & $8\>40\>47.97$& $19\>39\>32.3$& 1.32&   125.5& S& 
  $ 3.39 \pm 0.47$&   8.99& 11.02& 0.72 & Y & PhB, X  \\
KW 341  & $8\>40\>52.40$& $19\>28\>58.0$& 2.76&   234.8& S& 
  $ 4.78 \pm 0.52$&  12.66& 10.30& 0.52 & Y & SB1     \\
JC 143  & $8\>39\>03.01$& $19\>31\>58.5$& 1.57&   377.2& S& 
  $ 3.73 \pm 0.31$&   9.90& 16.92& 1.57 & Y & PhB, X  \\
JS 267  & $8\>39\>04.09$& $19\>31\>24.5$& 3.02&    26.9& S& 
  $ 0.68 \pm 0.16$&   1.81& 13.75& 1.21 & Y &         \\
JS 298  & $8\>39\>31.84$& $19\>24\>18.3$& 1.17&   229.8& S& 
  $ 1.68 \pm 0.17$&   4.47& 17.71& 1.59*& Y?&         \\
JS 305  & $8\>39\>38.56$& $19\>44\>19.5$& 2.31&    69.1& S& 
  $ 1.25 \pm 0.19$&   3.31& 17.92&      & Y?& $(c)$   \\
JS 329  & $8\>40\>00.78$& $19\>18\>35.5$& 0.86&   173.9& S& 
  $ 2.03 \pm 0.23$&   5.38& 14.43& 1.38 & Y &         \\
JS 349  & $8\>40\>15.35$& $19\>27\>31.7$& 3.11&    49.7& S& 
  $ 0.59 \pm 0.11$&   1.56& 13.91& 1.33 & Y &         \\
JS 706  & $8\>39\>15.15$& $19\>43\>31.6$& 0.42&   420.6& S& 
  $ 5.41 \pm 0.45$&  14.36& 16.96& 1.48*& Y &         \\
JS 718  & $8\>40\>04.26$& $19\>24\>51.0$& 1.16&   330.5& S& 
  $ 1.80 \pm 0.16$&   4.78& 18.02& 1.73*& Y &         \\
HSHJ 246& $8\>39\>03.31$& $19\>24\>06.3$& 9.95&    63.5& S& 
  $ 2.07 \pm 0.35$&   5.49&      & 1.70*& Y &         \\
HSHJ 258& $8\>39\>18.78$& $19\>22\>46.0$& 5.63&    10.4& P& 
  $ 2.31 \pm 0.76$&   1.33&      & 2.01*& Y & PhB     \\
HSHJ 283& $8\>39\>41.65$& $19\>29\>01.3$& 1.17&    30.0& S& 
  $ 0.34 \pm 0.08$&   0.89&      & 2.07*& Y & PhB     \\
HSHJ 289& $8\>39\>47.25$& $19\>39\>34.9$& 1.09&   132.5& S& 
  $ 0.88 \pm 0.11$&   2.32&      & 1.68*& Y &         \\
HSHJ 291& $8\>39\>54.52$& $19\>27\>37.9$& 1.51&    91.4& S& 
  $ 0.57 \pm 0.08$&   1.51&      & 1.77*& Y &         \\
HSHJ 293& $8\>40\>02.70$& $19\>40\>35.6$& 2.90&    48.3& S& 
  $ 0.58 \pm 0.11$&   1.53&      & 1.45*& Y &         \\
HSHJ 302& $8\>40\>11.62$& $19\>39\>12.7$& 0.79&   796.8& S& 
  $ 2.91 \pm 0.18$&   7.73&      & 1.45*& Y &         \\
HSHJ 328& $8\>40\>41.77$& $19\>30\>05.3$& 4.79&    32.5& S& 
  $ 0.61 \pm 0.13$&   1.62&      & 2.07*& Y & PhB     \\
WRS 4   & $8\>39\>12.62$& $19\>30\>14.4$& 2.82&   100.7& S& 
  $ 0.38 \>(g)   $&   0.88& 20.79&      & Y & $(d)$   \\
J0839531+192403& $8\>39\>53.23$& $19\>24\>04.0$& 0.41& 766.5& S& 
  $ 3.31 \pm 0.20$&   8.77&      &      & Y?& $(e)$   \\
J0840394+194255& $8\>40\>39.32$& $19\>42\>54.1$& 2.18& 35.3& M& 
  $ 2.06 \pm 0.49$&   5.47&      &      & Y & $(f)$   \\ 
\noalign{\smallskip}
\hline
\noalign{\smallskip}
\multicolumn{12}{l}{$(a)$ Luminosity in the {\it ROSAT} band ($0.1-2.4$ keV)
in units of $10^{28}$ erg~s$^{-1}$; \hskip 0.2cm $(b)$ An X indicates ROSAT
detections.}\\ 
\multicolumn{12}{l}{$(c)$ $V-I_{\rm k} = 2.41$; \hskip 0.2cm $(d)$ $V-I_{\rm
k} = 3.46$; \hskip 0.2cm $(e)$ $J=13.94$, $K_{\rm s} = 13.03$; \hskip 0.2cm
$(f)$ $J=13.48$, $K_{\rm s} = 12.61$.}\\
\multicolumn{12}{l}{$(g)$ The X-ray source is blended with GSC2 N231230081115:
the total count rate is $1.14\pm 0.13$, WRS 4 contributes by $\sim$$ 1/3$ (see
text)}\\
\multicolumn{12}{l}{Star names are from \citet[ KW]{kw27}, \citet[ JC]{jc83},
\citet[ JS]{js91}, \citet[ HSHJ]{hshj95},}\\ 
\multicolumn{12}{l}{and \citet[ WRS]{wrs95}. For the last two stars from
\citet{adams02} the 2MASS identification is given.}\\
\end{tabular}
\label{detmemb}
\end{table}