  The results of searches for selectrons, charginos and neutralinos performed
with the data collected by the ALEPH detector at LEP at centre-of-mass energies
up to 209 GeV are interpreted in the framework of the Minimal Supersymmetric
extension of the Standard Model with R-parity conservation. Under the
assumptions of gaugino and sfermion mass unification and no sfermion mixing, an
absolute lower limit of 73 GeV/c2 is set on the mass of the lighter selectron
at the 95% confidence level. Similarly, limits on the masses of the heavier
selectron and of the sneutrino are set at 107 and 84 GeV/c2, respectively.
Additional constraints are derived from the results of the searches for Higgs
bosons. The results are also interpreted in the framework of minimal
supergravity.
