Issue |
A&A
Volume 418, Number 2, May I 2004
|
|
---|---|---|
Page(s) | 663 - 673 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20034518 | |
Published online | 09 April 2004 |
Mid-infrared observations of young stellar objects
in the vicinity of
Orionis*
Astrophysics Group, School of Chemistry & Physics, Keele University, Staffordshire ST5 5BG, UK
Corresponding author: J. M. Oliveira, joana@astro.keele.ac.uk
Received:
15
October
2003
Accepted:
26
January
2004
We present new mid-infrared observations of objects in the vicinity of the O-star σ Orionis, obtained with TIMMI-2 at ESO. By constraining their near- and mid-infrared spectral energy distributions, we established the nature of previously known IRAS sources and identified new mid-infrared sources as young stellar objects with circumstellar disks, likely massive members of the σ Ori cluster. For two of these objects we have obtained spectroscopy in the 8–13 μm range in order to investigate the chemistry of the dust grains. TX Ori exhibits a typical silicate emission feature at 10 μm, with a feature at about 11.2 μm that we identify as due to crystalline olivine. The IRAS 05358-0238 spectrum is very unusual, with a weak silicate feature and structure in the range 10–12 μm that may be explained as due to self-absorbed forsterite. We also provide the first evidence for the presence of circumstellar disks in the jet sources Haro 5-39/HH 447, V510 Ori/HH 444 and V603 Ori/HH 445.
Key words: stars: circumstellar matter / stars: pre-main sequence / stars: planetary systems: protoplanetary disks / infrared: stars / Galaxy: open clusters and associations: individual: σ Orionis
© ESO, 2004
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