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Disks around Hot Stars in the Trifid Nebula

AuthorsLefloch, Bertrand; Cernicharo, José ; Cesarsky, D.; Demyk, K.; Miville-Deschenes, M.A.; Rodriguez, L.F.
KeywordsDust, extinction
ISM : HII regions
ISM : individual : Trifid
Stars : formation
Issue Date24-Jan-2001
AbstractWe 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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