THE IC 2391 SUPERCLUSTER

Sixty-three field stars and the sparse cluster IC 2391 have been identified as members of the IC 2391 supercluster. The members have at least 95% of their space motion, directed toward (A,D) = (5h.82, -12-degrees.44). Like members of the very similar Pleiades supercluster, the IC 2391 supercluster contains objects of two ages: t = 8 X 19(7) and 2.5 x 10(8) yr. A prototype very active chromosphere (VAC) star and the enigmatic giant variable TZ For are supercluster members together with two A-type stars suspected of possessing particulate disks. An especially interesting member is the system of Xi Cep (HR 8417) in which the two brightest components are greatly undermassive.