BAR STRENGTHS, BAR LENGTHS, AND COROTATION RADII, DERIVED PHOTOMETRICALLY FOR 10 BARRED GALAXIES

We have used photometric images of 10 barred galaxies in the B and I b ands to infer geometric and dynamical parameters of their bars: their lengths, their strengths, and their corotation radii. The bar length, R-bar, is measured as the radius at which the odd Fourier components o f the I image show a rise, accompanied by a blue peak in the B-l radia l profile. The bar strength, S-bar, is defined as the integral of the amplitude ratio of the m = 2 component to the m = 0 component, over th e radial range to the end of the bar. The corotation radius, R-CR, is determined as the first crossing point of the loci of the phase curves defining the radial dependence of the azimuthal maxima for the B and I images. With these definitions, we find that R-CR, is in all cases s lightly larger than R-bar, with a mean value close to 1.2R(bar). We fi nd a weak dependence of the ratio R-CR/R-bar on morphological type, an d a better correlated, though also shallow, dependence of this paramet er on S-bar.