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We present the results of a study of the temporal behaviour of severaldiagnostic lines formed in the region of the accretion-disk/star interaction inthe three magnetic Herbig Ae stars HD101412, HD104237, and HD190073. More than100 spectra acquired with the ISAAC, X-shooter, and CRIRES spectrographsinstalled at the VLT-8m telescope (ESO, Chile), as well as at otherobservatories (OHP, Crimean AO) were analyzed. The spectroscopic data wereobtained in the He I lambda10830, Pa gamma and He I lambda5876 lines. We foundthat the temporal behaviour of the diagnostic lines in the spectra of allprogram stars can be widely explained by a rotational modulation of the lineprofiles generated by a local accretion flow. This result is in good agreementwith the predictions of the magnetospheric accretion model. For the first time,the rotation period of HD104237 (P_rot = 5.37+-0.03 days), as well as theinclination angle (i = 21+-4deg) were determined. Additional analysis of theHARPSpol spectra of HD104237 and HD190073, taken from the ESO archive, with theuse of the SVD method shows that the magnetic field structure of HD190073 islikely more complex than a simple dipole and contains a circumstellarcomponent. For the first time, the magnetic field of the secondary component ofthe binary system HD104237 was also detected (<B_z> = 128+-10G).

Probing the Structure of the Accretion Region in a Sample of Magnetic Herbig Ae/Be Stars