It is shown that a bar which possesses a 1:1 resonance is unlikely to extend close to corotation and suggested that at least some bars in galaxies end because of this resonance. In this case the spiral arms are confined within the corotation radius. This could explain why dust lanes along the spiral arms often appear on the trailing side of the spiral.
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Πέτρου et al. (1986) studied this question.
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