Volume 418, Number 2, May I 2004
|Page(s)||663 - 673|
|Section||Stellar structure and evolution|
|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, firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.