... S140 IRS

Based on observations obtained at the German-Spanish Astronomical Centre, Calar Alto, operated by the Max-Planck-Instiute for Astronomy, Heidelberg, jointly with the Spanish National Commission for Astronomy.

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... compression

See e.g. Elmegreen & Lada (1977) for an overview of triggered star formation in OB association, and e.g. Fukuda & Hanawa (2000) for models of sequential triggered star formation by expansion of an HII region.

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