Abstract
We present results on a sample of 7 nearby luminous radiogalaxies (z < 0.08, P 178MHz ≳, 1025 W Hz-1 Sr-1), which mostly correspond to the FR II class. In two cases, Hydra A and 3C 285, the Balmer and λ4000 break indices constrain the spectral types and luminosity classes of the stars involved, revealing that the blue spectra are dominated by blue supergiant and/or giant stars. The ages derived for the last burst of star formation in Hydra A are between 7 and 40 Myr, and in 3C 285 about 10 Myr. The rest of the narrow-line radiogalaxies (four) have λ4000 break and metallic indices consistent with those of elliptical galaxies. The only broad-line radiogalaxy in our sample, 3C 382, has a strong featureless blue continuum and broad emission lines that dilute the underlying blue stellar spectra.
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