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We examine the optical properties of the nuclei of low luminosityradio-galaxies using snapshot HST images of the B2 sample. In agreement withthe results obtained from the analysis of the brighter 3C/FRI sample, we find acorrelation between fluxes (and luminosities) of the optical and radio cores.This provides further support for the interpretation that the optical nuclearemission in FRI is dominated by synchrotron emission and that accretion inthese sources takes place in a low efficiency radiative regime. In theframework of the FRI/BL Lacs unified scheme, we find that the luminositydifference between FRI and BL Lac nuclei can be reproduced with a commonbeaming factor in both the radio and the optical band, independent of theextended radio luminosity, thus supporting such a scenario. The correspondingbulk Lorentz factor is significantly smaller than is expected fromobservational and theoretical considerations in BL Lacs: this can beinterpreted as due to a velocity structure in the jet, with a fast spinesurrounded by a slower layer.Comment: 8 pages, 8 figures, 1 table, to be published in A&

The HST survey of the B2 sample of radio-galaxies: Optical nuclei and the FR I/BL Lac unified scheme