H II regions, morphology and star formation in disc galaxies.
The distribution and morphology of H II regions in the discs of spirals has been examined in great detail for a set of objects imaged in Hα. In those with welldefined spiral arms the resonance structure is beautifully revealed by comparing the Hα flux with that from the underlying neutral gas. It is possible to infer the pattern speed of the
Beckman, J. E. et al.
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1990