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For refcode 1998AJ....116.2136A:
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1998AJ....116.2136A BAR STRENGTHS, BAR LENGTHS, AND COROTATION RADII, DERIVED PHOTOMETRICALLY FOR 10 BARRED GALAXIES J. A. L. AGUERRI, J. E. BECKMAN, AND M. PRIETO Instituto de Astrofisica de Canarias, Via Lactea, E-38200 La Laguna, Tenerife, Spain; jalfonso@ll.iac.es, avp@ll.iac.es, mpm@ll.iac.es Received 1998 June 18; revised 1998 July 28 ABSTRACT We have used photometric images of 10 barred galaxies in the B and I bands 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 of the I image show a rise, accompanied by a blue peak in the B-I radial 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 the 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 slightly larger than R_bar_, with a mean value close to 1.2 R_bar_. We find a weak dependence of the ratio R_CR_/R_bar_ on morphological type, and a better correlated, though also shallow, dependence of this parameter on S_bar_. Key words: galaxies: kinematics and dynamics-galaxies: photometry
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