期刊
ASTRONOMY & ASTROPHYSICS
卷 376, 期 3, 页码 907-916出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20010962
关键词
stars : formation; stars : low-mass, brown dwarfs; stars : pre-main sequence; infrared : stars
We present the results of deep (K-s = 18.9) sub-arcsec resolution (0.3) imaging observations of the Cederblad 110 region in the Chamaeleon I dark cloud. This region (roughly 5' x 5') 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 similar to 2 (similar to 320 AU 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.
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