  The Galaxy Evolution Explorer (GALEX) detected ultraviolet emission in about
50% of multi-spin early-type galaxies (ETGs), suggesting the occurrence of a
recent rejuvenation episode connected to the formation of these kinematical
features. With the aim at investigating the complex evolutionary scenario
leading to the formation of counter rotating ETGs (CR-ETGs) we use our Smooth
Particle Hydrodynamic (SPH) code with chemo-photometric implementation. We
discuss here the UV evolutionary path of two CR-ETGs, NGC 3593 and NGC 5173,
concurrently best fitting their global observed properties, i.e., morphology,
dynamics, as well as their total B-band absolute magnitude and spectral energy
distribution (SED) extended over three orders of magnitude in wavelength. These
simulations correspond to our predictions about the target evolution which we
follow in the color-magnitude diagram (CMD), near-UV (NUV) versus r-band
absolute magnitude, as a powerful diagnostic tool to emphasize rejuvenation
episodes.
