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Azimuthal color (age) gradients across spiral arms are one of the mainpredictions of density wave theory; gradients are the result of star formationtriggering by the spiral waves. In a sample of 13 spiral galaxies of types Aand AB, we find that 10 of them present regions that match the theoreticalpredictions. By comparing the observed gradients with stellar populationsynthesis models, the pattern speed and the location of major resonances havebeen determined. The resonance positions inferred from this analysis indicatethat 9 of the objects have spiral arms that extend to the outer Lindbladresonance (OLR); for one of the galaxies, the spiral arms reach the corotationradius. The effects of dust, and of stellar densities, velocities, andmetallicities on the color gradients are also discussed.

Spiral density wave triggering of star formation in SA and SAB galaxies