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Our knowledge of the presence and the role of magnetic fields inintermediate-mass pre-main-sequence stars remains very poor.  We present the magnetic properties of four Herbig Ae/Be stars that have notbeen previously studied in detail.  Our results for the three Herbig Ae/Be stars HD97048, HD150193, and HD176386are based on multi-epoch low-resolution spectra obtained in spectropolarimetricmode with FORS2 mounted on the VLT. New high-resolution polarimetric spectrawere obtained for MWC480 with the SOFIN spectrograph installed at the NordicOptical Telescope. We discuss 41 FORS2 low-resolution observations of theHerbig Ae/Be stars HD97048, HD150193, and HD176386 and determine theirrotational periods. Using stellar fundamental parameters and the longitudinalmagnetic field phase curves, we place constraints on the magnetic fieldgeometry. Three high-resolution circularly polarised SOFIN spectra obtained forMWC480 were measured using the moment technique where wavelength shifts betweenright- and left-hand side circularly polarised spectra are interpreted in termsof a longitudinal magnetic field <B_z>.  Our search for periodicities resulted in P=0.693d for HD97048, P=1.317d forHD150193, and P=0.899d for HD176386. The magnetic field geometry can likely bedescribed by a centred dipole with a polar magnetic field strength B_d ofseveral hundred Gauss. The longitudinal magnetic-field measurements of MWC480reveal the presence of a strong kG field, which was undetected in our previouslow-resolution polarimetric observations with FORS1. A weak magnetic field wasdetected in the circumstellar components of the Ca II H&K lines and the Na I Dlines, indicating a complex interaction between the stellar magnetic field andthe circumstellar environment.

Characterising the magnetic fields of the Herbig Ae/Be stars HD97048, HD150193, HD176386, and MWC480