  We present the results of HST WFPC2 observations of FS Tau and its
environment obtained in the narrow-band emission line filters H alpha and [S
II] (lambda = 6716,6731 Angstrom). Based on these data the morphology of line
emission within this region can be studied on a size scale of 0.1" for the
first time. Despite the fact that FS Tau A has strong forbidden emission lines,
there is no evidence for extended emission at these wavelengths beyond 0.5"
from the components of this close T Tauri binary system. In the FS Tau B
outflow interesting morphological properties can be studied at high spatial
resolution. In this jet we find a structure where circular or elliptical jet
knots are correlated with minima of the jet width. The overall width of this
jet decreases with distance from the source. The FS Tau B jet is thus a rare
example of a jet which may be recollimated far away from its source. The jet is
much more prominent in H alpha than in [S II], while the counterjet shows the
opposite behaviour. The line ratio H alpha/[S II] increases with lateral
distance from the jet axis which is indicative of entrainment of ambient
material.
