Limits on the electromagnetic and weak dipole moments of the tau-lepton in E6 superstring models

We obtain limits on the electromagnetic and weak dipole moments of the tau-lepton in the framework of a left right symmetric model (LRSM) and a class of E-6 inspired models with an additional neutral vector boson Z(theta). Using as an input the data obtained by the L3 and OPAL collaborations for the reaction e(+) e(-) -> tau(+) tau(-) gamma, we get a stringent limit on the LRSM mixing angle phi, -1.66 x 10(-3) < phi < 1.22 x 10(-3), which in turn induces bounds on the tau weak dipole moments which are consistent with the bounds obtained recently by the DELPHI and ALEPH collaborations from the reaction e(+) e(-) -> tau(+) tau(-) . We also get similar bounds for the weak dipole moments of the tau lepton in the framework of E-6 superstring models.