  H_alpha spectropolarimetry on Herbig Ae/Be stars shows that the innermost
regions of intermediate mass (2 -- 15 M_sun) Pre-Main Sequence stars are
flattened. This may be the best evidence to date that the higher mass Herbig Be
stars are embedded in circumstellar discs.
  A second outcome of our study is that the spectropolarimetric signatures for
the lower mass Herbig Ae stars differ from those of the higher mass Herbig Be
stars. Depolarisations across H_alpha are observed in the Herbig Be group,
whereas line polarisations are common amongst the Herbig Ae stars in our
sample. These line polarisation effects can be understood in terms of a compact
H_alpha source that is polarised by a rotating disc-like configuration. The
difference we detect between the Herbig Be and Ae stars may be the first
indication that there is a transition in the Hertzsprung-Russell Diagram from
magnetic accretion at spectral type A to disc accretion at spectral type B.
However, it is also possible that the compact polarised line component, present
in the Herbig Ae stars, is masked in the Herbig Be stars due to their higher
levels of H_alpha emission.
