2005A&A...431..539P


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET04:07:16

2005A&A...431..539P - Astronomy and Astrophysics, volume 431, 539-545 (2005/2-4)

The enigmatic brown dwarf candidate [KG2001] 102 in the Chamaeleon I cloud: Is it a multiple system?

PERSI P., TAPIA M., GOMEZ M., ROTH M. and MARENZI A.R.

Abstract (from CDS):

We present deep IJHKs and H2 images of a region in the Chamaeleon I dark cloud containing the very low-mass young object [KG2001] 102, in an attempt to search for multiplicity and molecular outflow in the vicinity of this object. No low-velocity shocked structures were detected in our H2 image. The broad-band and narrow-band images show that [KG2001] 102 is composed of four objects within a radius of ∼2''. The brightest component [KG2001] 102A shows near-IR excess emission and its mass is estimated to be in the range 33 to 55MJup, depending on which model is adopted. Red spectra were obtained of the two fainter components B and C. The spectrum of the former suggests a K7V spectral type while the spectrum of component C is too noisy to allow a reliable classification but rules out a late M-type. The three faint components (B, C and D) have IJHK colors that suggest a much later spectral type, with extinctions similar to other members of the cloud. The computed probability of randomly finding a pair of field stars like [KG2001] 102AB is 1.5x10–3 while for a triple optical system like [KG2001] 102ABC, it would be 3.8x10–5 and more than an order of magnitude lower for finding a quadruple system like this by chance projection.

Abstract Copyright:

Journal keyword(s): stars: low-mass, brown dwarfs - stars: formation - infrared: stars

Nomenclature: Table 1: [PTG2005] A (Nos A-D), [PTG2005] Anon N (Nos 1-2), [PTG2005] com-Anon 1 N=1.

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 - 2021
#notes
1 ITG 17 Y*O 04 39 47.4820305505 +26 01 40.693626234     21.556   15.78 M7 86 0
2 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1009 1
3 [NC98] Cha HA 1 Y*O 11 07 16.6694944374 -77 35 53.222755937   22.8 21.0   16.38 M7.5/8e 82 0
4 [PTG2005] com-Anon 1 * 11 09 44.6 -77 31 06           ~ 2 1
5 [PTG2005] Anon 1 * 11 09 44.9 -77 31 07           ~ 2 1
6 [PTG2005] D * 11 09 48.36 -77 31 21.0           ~ 2 0
7 [PTG2005] B * 11 09 48.6383643793 -77 31 21.352824812           K7V 3 0
8 [PTG2005] C * 11 09 49.00 -77 31 23.1           ~ 3 0
9 [KG2001] 102 Y*O 11 09 49.1459702022 -77 31 19.759411980         15.64 M5.5 14 0
10 [PTG2005] Anon 2 * 11 09 53.4071275004 -77 31 40.031625225           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-04:07:16

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