| Autor: |
Lyo, A-Ran, Song, Inseok, Lawson, Warrick A., Bessell, M. S., Zuckerman, B. |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; 5/21/2006, Vol. 368 Issue 3, p1451-1455, 5p, 1 Black and White Photograph, 3 Graphs |
| Abstrakt: |
We report the outcome of the deep optical/infrared photometric survey of the central region (33 × 33 arcmin2 or 0.9 pc2) of the η Chamaeleontis (η 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 ≈13 MJup. 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 were either not created in the η Cha cluster or lost due to the early dynamical history of the cluster and ejected to outside the surveyed areas. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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