期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 368, 期 3, 页码 1451-1455出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2006.10232.x
关键词
stars : fundamental parameters; stars : pre-main-sequence; open clusters and associations : individual :eta Chamaeleontis
We report the outcome of the deep optical/infrared photometric survey of the central region (33 x 33 arcmin(2) or 0.9 pc(2)) of the eta Chamaeleontis (eta Cha) pre-main sequence star cluster. The completeness limits of the photometry are I = 19.1, J = 18.2 and H = 17.6, faint enough to reveal low-mass members down to the brown dwarf and planet boundary of approximate to 13 M-Jup. We found no such low-mass members in this region. Our result combined with a previous shallower (I = 17) but larger area survey indicates that low-mass objects (0.013 < M/M-circle dot < 0.075) were either not created in the eta Cha cluster or lost due to the early dynamical history of the cluster and ejected to outside the surveyed areas.
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