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Context. The Perseus complex in the outer disk of the Galaxy hosts a numberof clusters and associations of young stars. Gaia is providing a detailedcharacterization of their kinematic structure and evolutionary properties.Aims. Within the SPA Large Programme at the TNG, we secured HARPS-N and GIANO-Bhigh-resolution optical and near-infrared (NIR) spectra of the young redsupergiant (RSG) stars in the Perseus complex, in order to obtain accurateradial velocities, stellar parameters and detailed chemical abundances.Methods. We used spectral synthesis to best-fit hundreds of atomic andmolecular lines in the spectra of the observed 27 RSGs. We obtained accurateestimates of the stellar temperature, gravity, micro and macro turbulencevelocities and chemical abundances for 25 different elements. We also measuredthe $^{12}$C/$^{13}$C abundance ratio. Results. Our combined optical and NIRchemical study provides homogeneous half-solar iron with a small dispersion,about solar-scaled abundance ratios for the iron-peak, alpha and other lightelements and a small enhancement of Na, K and neutron-capture elements,consistent with the thin disk chemistry traced by older stellar populations ata similar Galactocentric distance of about 10 kpc. We inferred enhancement ofN, depletion of C and of the $^{12}$C/$^{13}$C isotopic abundance ratio,consistent with mixing processes in the stellar interiors during the RSGevolution.

Stellar population astrophysics (SPA) with the TNG -- The chemical content of the red supergiant population in the Perseus complex