Abstract
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)=(5 h .82, −12°.44). Like members of the very similar Pleiades supercluster, the IC 2391 supercluster contains objects of two ages : t=8×19 7 and 2.5×10 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
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