Issue |
A&A
Volume 377, Number 1, October I 2001
|
|
---|---|---|
Page(s) | 273 - 284 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20011053 | |
Published online | 15 October 2001 |
High mass Class I sources in M 17
Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstr. 150/NA 7, 44780 Bochum, Germany ESO European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
Corresponding author: M. Nielbock, mnielboc@eso.org
Received:
7
May
2001
Accepted:
16
July
2001
The region of M 17 has been imaged at 10.5 and 20.0 μm
with the groundbased infrared camera MANIAC. In addition to a prominent
diffuse emission bar (45
0
3) extending southeast to
northwest at the interface between the Hii region and the
southwestern molecular cloud, the mosaic of 133 single frames at each
wavelength revealed 22 compact sources. One of these sources is the
Kleinmann-Wright-Object and another was previously identified as
the ultra-compact Hii region M 17-UC1. Combining the N-band
and Q-band data with near infrared data yielded spectral energy
distributions that classifies all sources to be of Class I. The observed
luminosities were between 55 and 4775
, which suggests
that these sources represent the youngest generation of massive early
type stars in M 17 and are surrounded by relics of their protostellar
clouds. The morphology of the 10.5 and 20.0 μm emission towards some
of the sources reveals flattened structures and may be the first evidence
of the presence of circumstellar disks around massive stars.
Key words: ISM: dust, extinction / ISM: HII regions / ISM: individual objects: M 17 / stars: formation
© ESO, 2001
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