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On the Origin of the Very Young Groups η and ϵ Chamaeleontis

The three-dimensional orbits of the kinematical centers of the η Cha and ϵ Cha compact groups are retraced under the action of a general Galactic potential. The results show that both groups were formed in the same spatial region about 7 Myr ago. Their birthplace appears to be quite near the Lower Centaurus Crux subgroup of the Sco-Cen OB association. The epoch of minimum separation in the past between η Cha and ϵ Cha turns out to be consistent with the estimated evolutionary age.