Volume 408, Number 3, September IV 2003
|Page(s)||L25 - L28|
|Published online||17 November 2003|
Letter to the Editor
Triggered massive-star formation at the border of the HII region Sh 104
Laboratoire d'Astrophysique de Marseille, 2 place le Verrier, 13248 Marseille Cedex 4, France
2 Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414 rue de la Piscine, BP 53, 38041 Grenoble Cedex 9, France
3 Department of Physics and Astronomy, University of Wales, Cardiff CF24 3YB, Wales, UK
4 Observatoire du Mont Megantic et Département de Physique, Université de Montréal, CP 6128, Succ. Centre-Ville, Montréal, QC, Canada, H3C3J7
5 IRAM, Avenida Divina Pastora, 7, 18012 Granada, Spain
Corresponding author: L. Deharveng, firstname.lastname@example.org
Accepted: 29 July 2003
We present millimetre-line imaging of the Galactic H ii region Sh 104. We show that it is surrounded by a ring of molecular gas and dust. Four large molecular condensations are regularly spaced around the ring. These condensations are themselves fragmented and contain several massive dense cores. A deeply embedded cluster is observed in the near IR towards the largest condensation. It contains at least one massive star ionizing an ultra-compact H ii region. The Sh 104 region is a good illustration of the “collect and collapse” model for star formation triggered by the expansion of an H ii region.
Key words: stars: formation / stars: early-type / ISM: H ii regions / ISM: individual: Sh2-104
© ESO, 2003
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