The triple gauge-boson couplings involving the W are determined using data
samples collected with the ALEPH detector at mean centre-of-mass energies o
f 183 GeV and 189 GeV, corresponding to integrated luminosities of 57 pb(-1
) and 174 pb(-1), respectively. The couplings, g(1)(Z), kappa (gamma) and l
ambda (gamma) are measured using W-pair events, single-W production and sin
gle-gamma production. Each coupling is measured individually with the other
two couplings fixed at their standard model value. Including ALEPH results
from lower energies, the 95% confidence level intervals for the deviation
to the standard model are
-0.087 < Deltag(1)(Z) < 0.141, -0.200 < Delta kappa (gamma) < 0.258, and -
0.062 < lambda (gamma) < 0.147.
Fits are also presented where two or all three couplings are allowed to var
y. In addition, W-pair events are used to set limits on the C- or P-violati
ng couplings g(4)(V), g(5)(V), <(<kappa>)over tilde>(V) and <(<lambda>)over
tilde>(V), where Vdenotes either gamma or Z. No deviations from the standa
rd model expectations are observed.