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We present the analysis of the U-V rest-frame color distribution and somespectral features as a function of mass and environment for two sample ofearly-type galaxies up to z=1 extracted from the zCOSMOS spectroscopic survey.The first sample ("red galaxies") is defined with a photometric classification,while the second ("ETGs") by combining morphological, photometric, andspectroscopic properties to obtain a more reliable sample. We find that thecolor distribution of red galaxies is not strongly dependent on environment forall mass bins, with galaxies in overdense regions redder than galaxies inunderdense regions with a difference of 0.027\pm0.008 mag. The dependence onmass is far more significant, with average colors of massive galaxies redder by0.093\pm0.007 mag than low-mass galaxies throughout the entire redshift range.We study the color-mass relation, finding a mean slope 0.12\pm0.005, while thecolor-environment relation is flatter, with a slope always smaller than 0.04.The spectral analysis that we perform on our ETGs sample is in good agreementwith our photometric results: we find for D4000 a dependence on mass betweenhigh and low-mass galaxies, and a much weaker dependence on environment(respectively a difference of of 0.11\pm0.02 and of 0.05\pm0.02); for theequivalent width of H{\delta}we measure a difference of 0.28\pm0.08 {\AA}acrossthe same mass range and no significant dependence on environment.By analyzingthe lookback time of early-type galaxies, we support the possibility of adownsizing scenario, in which massive galaxies with a stronger D4000 and analmost constant equivalent width of $H\delta$ formed their mass at higherredshift than lower mass ones. We also conclude that the main driver of galaxyevolution is the galaxy mass, the environment playing a subdominant role.

zCOSMOS 10k-bright spectroscopic sample: exploring mass and environment dependence in early-type galaxies