  Interactions between disc-surrounded stars might play a vital role in the
formation of planetary systems. Here a first parameter study of the effects of
encounters on low-mass discs is presented. The dependence of the mass and
angular momentum transport on the periastron distance, the relative mass of the
encountering stars and eccentricity of the encounter is investigated in detail.
This is done for prograde and retrograde coplanar encounters as well as
non-coplanar encounters. For distant coplanar encounters our simulation results
agree with the analytical approximation of the angular momentum loss by
Ostriker(1994). However, for close or high-mass encounters, significant
differences to this approximation are found. This is especially so in the case
of retrograde encounters, where the analytical result predict no angular
momentum loss regardless of the periastron distance whereas the simulations
find up to ~ 20% loss for close encounters. For the non-coplanar case a more
complex dependency on the inclination between orbital path and disc plane is
found than for distant encounters. For the coplanar prograde case new fitting
formulae for the mass and angular momentum loss are obtained, which cover the
whole range from grazing to distant encounters. In addition, the final disc
size and the mass exchange between discs is examined, demonstrating that for
equal mass stars in encounters as close as 1.5 the disc radius, the disc size
only is reduced by approximately 10%.
