Issue |
A&A
Volume 399, Number 3, March I 2003
|
|
---|---|---|
Page(s) | 995 - 1002 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20021856 | |
Published online | 14 February 2003 |
Near–infrared and ISOCAM observations of the Chamaeleon II dark cloud *,**
1
Istituto Astrofisica Spaziale e Fisica Cosmica, CNR, via del Fosso del Cavaliere, 00133, Roma, Italy e-mail: persi@rm.iasf.cnr.it
2
Observatorio Astronómico de Córdoba, Laprida 854, 5000 Córdoba, Argentina
3
Stockholm Observatory, SCFAB, 106 91 Stockholm, Sweden
Corresponding author: P. Persi, persi@rm.iasf.cnr.it
Received:
3
October
2002
Accepted:
3
December
2002
An infrared study including ISOCAM images at 6.75 and
14.3 of a large portion (28´
26´) of the
Chamaeleon II dark cloud and sub-arcsec resolution JHKs images
of the central (4.9´
4.9´) area is presented.
Combining the ISOCAM observations with J and Ks photometry
obtained with DENIS, we have found 12 young stars, of which 8 are
previously identified sources. Of the new candidate YSOs,
ISO-ChaII13 shows a clear mid–IR excess with an infrared
luminosity of ~0.02
and a stellar luminosity ≥0.01
. This last value of luminosity corresponds to that
expected for a sub–stellar object with an age between 1–10 Myr.
The analysis of the
/
diagram of the sources detected in
the central part of the dark cloud has allowed us to identify 10
very faint sources not found by ISOCAM with possible near-IR
excesses that may be embedded young brown dwarfs. Finally, the
center of the dark cloud is characterized by the presence of the
Class I YSO IRAS 12553–7651 (ISO-ChaII28) with
1.49
, and associated with a faint nebulosity observed at 2.2
.
Key words: stars: formation / stars: low-mass, brown dwarfs / stars: pre-main sequence / infrared: stars
© ESO, 2003
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