Large circumbinary dust grains around evolved giants?

We have detected continuum emission at 450 mum, 850 mum, and 1.35 mm from S S Lep (or 17 Lep), 3 Pup, and probably BM Gem, respectively, which are like ly or confirmed binary systems consisting of at least one evolved giant. Th e observed submillimeter fluxes are probably emitted by grains rather than ionized gas. The fluxes are larger than those expected from a "normal" dust y wind; the dust temperature is less than or equal to 70 K within 6" of the stars. To explain why grains are so cold near the star, we suggest that th e emission at lambda greater than or equal to 450 mum is produced by partic les as large as 0.1 mm in radius and that these large particles probably ha ve grown by coagulation in circumbinary orbiting disks with masses, greater than or equal to5 x 10(28) g.