Table 1: JCMT/SCUBA wide photometry at 850 $\mu $m.

Star		 Sp. RAa Deca Dist. Log (Lx)b Moving Integration Flux density Size c Dust Dust
  type (J2000) (J2000) (pc) Log (erg/s) Group time (mJy) (AU) tempd masse
              (h)     (K) (moon)
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
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.

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