The existence of circumstellar disks around magnetically active
 M dwarfs in nearby clusters of known age will be investigated, with
 the goal of defining the relation between age, disk properties,
 and the evolution of magnetic activity.  Early (M0-M1) and late
 (M4-M5) type stars will be included, to determine if the disks
 change as a function of mass, in accord with the activity.
 A further investigation of the redistribution of luminosity
 into the far-IR in active field stars, as compared to inactive
 ones, will also be carried out on both early and late type stars.
 Such redistribution is expected if magnetic activity in M dwarfs
 is similar to that seen on the Sun.  The competing effects of
 circumstellar disk emission and luminosity redistribution can
 then be compared in stars of different age and mass.
 ISO provides the only opportunity to obtain the observations
 necessary to carry out this program, as the far-IR data
 required cannot be obtained from the ground, and the IRAS
 database does not contain the required targets, nor is
 it sensitive enough to accomplish the goals.