Disks around Hot Stars in the Trifid Nebula

Details Disks around Hot Stars in the Trifid Nebula Disks around Hot Stars in the Trifid Nebula

2001-01-24

arxiv.org/abs/astro-ph/0101435v2

Astronomy and Astrophysics

Astrophysics

4 pages with 1 figure

Scientific paper

10.1051/0004-6361:20010209

We report on mid-IR observations of the central region in the Trifid nebula, carried out with ISOCAM in several broad-band infrared filters and in the low resolution spectroscopic mode provided by the circular variable filter. Analysis of the emission indicates the presence of a hot dust component (500 to 1000 K) and a warm dust component at lower temperatures (150-200 K) around several members of the cluster exciting the HII region, and other stars undetected at optical wavelengths. Complementary VLA observations suggest that the mid-IR emission could arise from a dust cocoon or a circumstellar disk, evaporated under the ionization of the central source and the exciting star of the nebula. In several sources the $9.7\mu m$ silicate band is seen in emission. One young stellar source shows indications of crystalline silicates in the circumstellar dust.

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