2006MNRAS.368.1451L

Query : 2006MNRAS.368.1451L

2006MNRAS.368.1451L - Mon. Not. R. Astron. Soc., 368, 1451-1455 (2006/May-3)

A deep photometric survey of the η Chamaeleontis cluster down to the brown dwarf - planet boundary.

LYO A.-R., SONG I., LAWSON W.A., BESSELL M.S. and ZUCKERMAN B.

Abstract (from CDS):

We report the outcome of the deep optical/infrared photometric survey of the central region (33x33 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 (0.013 < M/M☉< 0.075) 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 Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stars: fundamental parameters - stars: pre-main-sequence - open clusters and associations: individual: η Chamaeleontis

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* AB Dor B ** 05 28 44.4839440512 -65 26 46.035814884           M5+M5-6 99 0
2 V* AB Dor C LM* 05 28 44.83 -65 26 54.9           M8: 71 0
3 * eta Cha Pu* 08 41 19.5125857944 -78 57 48.105898056 5.02 5.351 5.453     B8V 246 0
4 V* ES Cha Or* 08 41 30.3105474648 -78 53 06.477949932     17.07     M5.0 49 0
5 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
6 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
7 TWA 28 LM* 11 02 09.8378779824 -34 30 35.562199176     21.46 19.14 17.90 M8.3 91 0
8 TWA 26 LM* 11 39 51.1378374696 -31 59 21.443660124         15.83 M8e 125 0
9 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 376 0
10 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1

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