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Volume 368, Number 3, March IV 2001
Page(s) L13 - L16
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010209

A&A 368, L13-L16 (2001)
DOI: 10.1051/0004-6361:20010209

Disks around hot stars in the Trifid nebula

B. Lefloch1, J. Cernicharo2, D. Cesarsky3, K. Demyk4 and L. F. Rodriguez5

1  Laboratoire d'Astrophysique de l'Observatoire de Grenoble, BP 53, 38041 Grenoble Cedex, France
2  Consejo Superior de Investigaciones Científicas, Instituto de Estructura de la Materia, Serrano 123, 28006 Madrid, Spain
3  Max-Planck Institut für Extraterrestrische Physik, 85741 Garching, Germany
4  Institut d'Astrophysique Spatiale, Bât. 121, Université Paris XI, 91405 Orsay Cedex, France
5  Instituto de Astronomía, UNAM, Campus Morelia, A.P. 3-72, Morelia, Mich. 58089, México

(Received 8 December 2000 / Accepted 21 January 2001)


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 $\rm 9.7 \mu m$ silicate band is seen in emission. One young stellar source shows indications of crystalline silicates in the circumstellar dust.

Key words: (ISM:) dust, extinction -- (ISM:) H II regions -- ISM: individual: Trifid -- stars: formation

Offprint request: B. Lefloch, lefloch@obs.ujf-grenoble.fr

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