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We construct pi-pi amplitudes that fulfill exact elastic unitarity, accountfor one loop Chiral Perturbation Theory contributions and include all 1/Ncleading terms, with the only limitation of considering just the lowest-lyingnonet of exchanged resonances. Within such scheme, the Nc dependence of sigmaand rho masses and widths is discussed. Robust conclusions are drawn in thecase of the rho resonance, confirming that it is a stable meson in the limit ofa large number of QCD colors, Nc. Less definitive conclusions are reached inthe scalar-isoscalar sector. With the present quality of data, we cannot firmlyconclude whether or not the Nc=3 f0(600) resonance completely disappears atlarge Nc or it has a sub-dominant component in its structure, which wouldbecome dominant for a number of quark colors sufficiently large.

Large-Nc Properties of the rho and f0(600) Mesons from Unitary Resonance Chiral Dynamics