Dynamics of ringed barred spiral galaxies. I. Surface photometry and kinematics of NGC 1433 and NGC 6300

This paper presents new near-infrared images and surface photometry and H a lpha Fabry-Perot radial velocities for NGC 1433 and NGC 6300, two large and previously well-studied nearby ringed barred spiral galaxies. Stellar abso rption-line radial velocities and new optical surface photometry are also p resented for NGC 1433. The data are intended to set the stage for dynamical modeling of the two galaxies, with the principal goals being to derive mas s distributions, bar mass-to-light ratios, bar pattern speeds, and resonanc e locations, parameters which have been derived for very few ringed disk ga laxies. The presence of strong rings and pseudorings in the two galaxies al lows the possibility to link specific orbital resonances with the observed rings. The new data allow us to derive a fairly complete composite rotation curve of NGC 1433, leading us to make some interesting preliminary judgmen ts about the structure of the galaxy. The new data also verify the previous finding that the radial velocity of the Seyfert nucleus in NGC 6300 differ s from the actual systemic velocity of the galaxy by nearly 100 km s(-1). W e demonstrate in this paper that the offset is not an artifact of significa nt extinction in the inner regions of the galaxy.