Fig. 17
Scenario of star formation in the W5 region. Top: the exciting stars of Sh 201, W5-E and W5-W formed in a dense filament. The exciting star of Sh 201 formed in the middle of the filament whereas those of W5-E and W5-W formed on its border. Middle: the expanding H ii regions have bursted out of the filament. In Sh 201 the ionized gas flows away of the filament in two opposite directions, forming a bipolar H ii region. Bottom: a new generation of stars is forming in the densest condensations, adjacent to the first generation H ii regions.
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