Relations between abundance characteristics and rotation velocity for star-forming MaNGA galaxies

We derive rotation curves, surface brightness profiles, and oxygen abundance distributions for 147 late-type galaxies using the publicly available spectroscopy obtained by the MaNGA survey. Changes of the central oxygen abundance (O/H)(0), the abundance at the optical radius (O/H)(R25), and the abundance gradient with rotation velocity V-rot were examined for galaxies with rotation velocities from 90 km s(-1) to 350 km s(-1). We find that each relation shows a break at V-rot* similar to 200 km s(-1). The central (O/H)(0) abundance increases with rising V-rot and the slope of the (O/H)(0)-V-rot relation is steeper for galaxies with V-rot less than or similar to V-rot*. The mean scatter of the central abundances around this relation is 0.053 dex. The relation between the abundance at the optical radius of a galaxy and its rotation velocity is similar; the mean scatter in abundances around this relation is 0.081 dex. The radial abundance gradient expressed in dex/kpc flattens with the increase of the rotation velocity. The slope of the relation is very low for galaxies with V-rot greater than or similar to V-rot*. The abundance gradient expressed in dex/R-25 is roughly constant for galaxies with V-rot less than or similar to V-rot*, flattens towards V-rot*, and then again is roughly constant for galaxies with V-rot greater than or similar to V-rot*. The change of the gradient expressed in terms of dex/h(d) (where h(d) is the disc scale length), in terms of dex/R-e,R-d (where R-e,R-d is the disc effective radius), and in terms of dex/R-e,R-g (where R-e,R-g is the galaxy effective radius) with rotation velocity is similar to that for gradient in dex/R-25. The relations between abundance characteristics and other basic parameters (stellar mass, luminosity, and radius) are also considered.