J/A+A/376/907 Near-IR Sources in the Cederblad 110 region. (Persi+ 2001)
Sub-arcsec resolution near-infrared images of the Cederblad 110 region.
Persi P., Marenzi A.R., Gomez M., Olofsson G.
<Astron. Astrophys. 376, 907 (2001)>
=2001A&A...376..907P 2001A&A...376..907P
ADC_Keywords: Stars, pre-main sequence ; Photometry, infrared
Keywords: stars: formation - stars: low-mass, brown dwarfs -
stars: pre-main sequence - infrared: stars
Abstract:
We present the results of deep (Ks=18.9) sub-arcsec resolution
(0.3") imaging observations of the Cederblad 110 region in the
Chamaeleon I dark cloud. This region (roughly 5'x5') is characterized
by the presence of six ISOCAM-detected young stellar objects (YSOs).
Our images have recovered all these sources at near-infrared (near-IR)
wavelengths. Ced 110 IRS4, the brightest object in the region, is
associated with a remarkable near-IR bipolar nebulosity. Ced 110 IRS6
is resolved in a double system IRS6a and IRS6b with a separation of
∼2" (∼320AU at the distance of the Cha I cloud). We have combined 1.3
mm, far and mid-IR fluxes from the literature with our JHK data and
obtained the spectral energy distributions (SEDs) for three (IRS4,
IRS6a and ISO-ChaI86) of the six ISOCAM sources in the region. We
modelled the SEDs of IRS6a and ISO-ChaI86 with a spherically symmetric
dusty envelope, using the DUSTY code. These objects are clear Class I
sources of the cloud. Finally, we report the detection of three new
objects in this region (NIR 72, 84 and 89) with significant near-IR
excess. If these sources are associated with the cloud, the derived
luminosities and masses suggest that they are candidate young brown
dwarfs of Chamaeleon I.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 69 165 List of the near-infrared sources (NIR) observed
in the Ced110 region
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- NIR Number of IR source in Cederblad 110
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 15 F5.2 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
30- 34 F5.2 mag Jmag ? J magnitude
38- 41 F4.2 mag e_Jmag ? rms uncertainty on Jmag
44- 48 F5.2 mag Hmag ? H magnitude
52- 55 F4.2 mag e_Hmag ? rms uncertainty on Hmag
58- 62 F5.2 mag Kmag K magnitude
66- 69 F4.2 mag e_Kmag rms uncertainty on Kmag
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Acknowledgements: Paolo Persi
(End) Patricia Bauer [CDS] 24-Jan-2002