IC 2391 is a young, nearby open cluster approximately centered on the
bright star o Velorum (=,
=, J2000). Hogg (1960) and
Lynga (1961) have
obtained proper motions and photometry for the brighter members of this
cluster, while spectroscopic data for these brighter members
() were presented by Feinstein (1961),
Perry & Bond (1969),
Levato & Malaroda (1984) and Levato et al. (1988).
These observations have shown that the cluster upper main-sequence contains
approximately 22 members with spectral types earlier than mid-F. The
apparent magnitudes and positions of these stars in the (V,B-V)
diagram are consistent with IC 2391 having a distance of order 150 pc and
an age of order yr. More recently, Stauffer et al.
(1989) identified 10 late-type members with spectral types in the range