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We have identified several lithium-rich low-mass (0.08<M<0.3 Msun). starswithin 5.5 deg of the young open cluster Eta Chamaeleontis, nearly four timesthe radius of previous search efforts. We propose 4 new probable clustermembers and 3 possible members requiring further investigation. Candidates wereselected on the basis of DENIS and 2MASS photometry, NOMAD astrometry andextensive follow-up spectroscopy. Several of these stars show substantialvariation in their H-alpha emission line strengths on timescales of days tomonths, with at least one event attributable to accretion from a circumstellardisk. These findings are consistent with a dynamical origin for the currentconfiguration of the cluster, without the need to invoke an abnormallytop-heavy Initial Mass Function, as proposed by some authors.

Revealing the Chamaeleon: First detection of a low-mass stellar halo around the young open cluster Eta Chamaeleontis