Disks around hot stars in the Trifid nebula
B. Lefloch, J. Cernicharo, D. Cesarsky, K. Demyk, M. A. Miville-Deschênes, L. F. Rodriguez;
AaA, 2001, 368, L13
ABSTRACT: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 H II 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 kern 0.20em mu m silicate band
is seen in emission.
One young stellar source shows indications of
crystalline silicates in the circumstellar dust.
KEYWORDS: (ism:) dust, extinction, (ism:) h{\kern 0.20em small ii} regions, ism: individual: trifid, stars: formation
CODE: lefloch2001