  We present the results of spectropolarimetric observations of 12 Herbig Ae/Be
objects. Our data have the largest spectropolarimetric wavelength coverage,
4560 {\AA} to 9480 {\AA}, published to date. A change in linear polarisation
across the H{\alpha} line, is detected in all objects. Such a line effect
reveals the fact that stellar photons are scattered off free electrons that are
not distributed in a spherically symmetric volume, suggesting the presence of
small disks around these accreting objects. Thanks to the large wavelength
coverage, we can report that H{\alpha} is the spectral line in the optical
wavelength range that is most sensitive to revealing deviations from spherical
symmetry, and the one most likely to show a line effect across the polarisation
in such cases. Few other spectral lines display changes in polarisation across
the line. In addition, H{\alpha} is the only line which shows an effect across
its absorption component in some sources. We present a scenario explaining this
finding and demonstrate that the detection of the line effect strongly relies
on the number of photons scattered into our line of sight. We highlight the
special case of R Mon, which is the only object in our sample to show many
lines with a polarisation effect, which is much stronger than in all other
objects. Given that the object and its nebulosity is spatially resolved, we
argue that this is due to scattering of the stellar and emission spectrum off
circumstellar dust.
