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We present the results of spectropolarimetric observations of 12 Herbig Ae/Beobjects. Our data have the largest spectropolarimetric wavelength coverage,4560 {\AA} to 9480 {\AA}, published to date. A change in linear polarisationacross the H{\alpha} line, is detected in all objects. Such a line effectreveals the fact that stellar photons are scattered off free electrons that arenot distributed in a spherically symmetric volume, suggesting the presence ofsmall disks around these accreting objects. Thanks to the large wavelengthcoverage, we can report that H{\alpha} is the spectral line in the opticalwavelength range that is most sensitive to revealing deviations from sphericalsymmetry, and the one most likely to show a line effect across the polarisationin such cases. Few other spectral lines display changes in polarisation acrossthe line. In addition, H{\alpha} is the only line which shows an effect acrossits absorption component in some sources. We present a scenario explaining thisfinding and demonstrate that the detection of the line effect strongly relieson the number of photons scattered into our line of sight. We highlight thespecial case of R Mon, which is the only object in our sample to show manylines with a polarisation effect, which is much stronger than in all otherobjects. Given that the object and its nebulosity is spatially resolved, weargue that this is due to scattering of the stellar and emission spectrum offcircumstellar dust.

Linear spectropolarimetry across the optical spectrum of Herbig Ae/Be stars