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In this paper, we present BVRI imaging data of NGC 613. We use these data todetermine the corotation radius of the bar, using the photometric phasecrossing method. This method uses the phase angle of the spiral structure inseveral wavebands, and looks for a crossing between the blue (B) light and theredder wavebands (e.g., R or I). For NGC 613, we find two phase crossings, anouter phase crossing at 136 +/- 8 arcsec and an inner phase crossing at 16 +/-8 arcsec. We argue that the outer phase crossing is due to the bar corotationradius, and from the bar length of $R_{\rm bar}=90.0\pm4.0$ arcsec we go on tocalculate a relative bar pattern speed of R = 1.5 +/- 0.1, which is consistentwith the results of previous methods described in the literature. For a betterunderstanding of the inner phase crossing, we have created structure maps inall four wavebands and a B-R color map. All of our structure maps and our colormap highlight a nuclear ring of star formation at a radius of ~4 arcsec, whichhad also been observed recently using ALMA. Furthermore, the radius of ourinner phase crossing appears to be consistent with the size of a nuclear diskof star formation that has been recently detected and described in theliterature. We therefore suggest that the phase crossing method can be used todetect the size of nuclear star formation regions as well as the location ofcorotation resonances in spiral galaxies.

Determination of resonance locations in NGC 613 from morphological arguments