  Aims. Our goal is to study the long-term mass-loss rate characteristics of
asymptotic giant branch (AGB) stars through wind-wind and wind-interstellar
medium interaction.
  Methods. Far-ultraviolet (FUV) images from the Galex survey are used to
investigate extended UV emission associated with AGB stars.
  Results. FUV emission was found towards eight objects. The emission displays
different shapes and sizes; interaction regions were identified, often with
infrared counterparts, but no equivalent near-ultraviolet (NUV) emission was
found in most cases.
  Conclusions. The FUV emission is likely attributed to shock-excited molecular
hydrogen, considering the lack of NUV emission and the large space velocities
of the objects, and makes it possible to trace old structures that are too
faint to be observed, for instance, in the infrared.
