Warm Dust around Hot Stars in the Trifid Nebula

Details Warm Dust around Hot Stars in the Trifid Nebula Warm Dust around Hot Stars in the Trifid Nebula

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.460..443l&link_type=abstract

The Promise of the Herschel Space Observatory. Eds. G.L. Pilbratt, J. Cernicharo, A.M. Heras, T. Prusti, & R. Harris. ESA-SP 460

Other

Stars: Formation, Stars: Early-Type, Ism: Hii Regions, Ism: Dust, Extinction

Scientific paper

We report on mid-infrared observations of the central region in the Trifid nebula, carried out with ISOCAM in several broad-band 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 (500-1000 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 the 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 micron silicate band is seen in emission. Around one young stellar source we found the presence of crystalline silicates in the circumstellar dust.

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