First detection of a low-mass stellar halo around the young open cluster η Chamaeleontis

Simon J. Murphy, Warrick A. Lawson, Michael S. Bessell
2010 Monthly Notices of the Royal Astronomical Society: Letters  
We have identified several lithium-rich low-mass (0.08<M<0.3 Msun) stars within 5.5 deg of the young open cluster Eta Chamaeleontis, nearly four times the radius of previous search efforts. Of these stars we propose 4 new probable cluster members, and 3 possible members requiring further investigation. These findings are consistent with a dynamical origin for the current configuration of the cluster, without the need to invoke an abnormal Initial Mass Function deficient in low-mass objects.
more » ... idates were selected on the basis of DENIS and 2MASS photometry, NOMAD astrometry and extensive follow-up spectroscopy.
doi:10.1111/j.1745-3933.2010.00879.x fatcat:b5uu3v2qhzhgpa7j3pxhttj42i