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Issue A&A Volume 408, Number 3, September IV 2003 Page(s) L25 - L28 Section Letters DOI 10.1051/0004-6361:20031157

A&A 408, L25-L28 (2003)
DOI: 10.1051/0004-6361:20031157

Letter

Triggered massive-star formation at the border of the HII region Sh 104

L. Deharveng¹, B. Lefloch², A. Zavagno¹, J. Caplan¹, A. P. Whitworth³, D. Nadeau⁴ and S. Martín<sup>5

1</sup>  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

(Received 19 June 2003 / Accepted 29 July 2003)

Abstract
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

Offprint request: L. Deharveng, lise.deharveng@oamp.fr

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