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| Paper: |
Revealing the Chamaeleon: First Detection of a Low-mass Stellar Halo Around the Young Open Cluster η Chamaeleontis |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
61 |
| Authors: |
Murphy, S. J.; Lawson, W. A.; Bessell, M. S. |
| Abstract: |
We have identified several lithium-rich low-mass (0.08 < M < 0.3 M☉). stars within 5.5 deg of the young open cluster η Chamaeleontis, nearly four times the radius of previous search efforts. We propose 4 new probable cluster members and 3 possible members requiring further investigation. Candidates were selected on the basis of DENIS and 2MASS photometry, NOMAD astrometry and extensive follow-up spectroscopy. Several of these stars show substantial variation in their Hα emission line strengths on timescales of days to months, with at least one event attributable to accretion from a circumstellar disk. These findings are consistent with a dynamical origin for the current configuration of the cluster, without the need to invoke an abnormally top-heavy Initial Mass Function, as proposed by some authors. |
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