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Models of magnetically-driven accretion and outflows reproduce manyobservational properties of T Tauri stars. This concept is not well establishedfor the more massive Herbig Ae/Be stars. We intend to examine themagnetospheric accretion in Herbig Ae/Be stars and search for rotationalmodulation using spectroscopic signatures, in this first paper concentrating onthe well-studied Herbig Ae star HD101412. We used near-infrared spectroscopicobservations of the magnetic Herbig Ae star HD101412 to test the magnetosphericcharacter of its accretion disk/star interaction. We reduced and analyzed 30spectra of HD101412, acquired with the CRIRES and X-shooter spectrographsinstalled at the VLT (ESO, Chile). The spectroscopic analysis was based on theHe I lambda 10,830 and Pa gamma lines, formed in the accretion region. We foundthat the temporal behavior of these diagnostic lines in the near-infraredspectra of HD101412 can be explained by rotational modulation of line profilesgenerated by accreting gas with a period P = 20.53+-1.68 d. The discovery ofthis period, about half of the magnetic rotation period P_m = 42.076 dpreviously determined from measurements of the mean longitudinal magneticfield, indicates that the accreted matter falls onto the star in regions closeto the magnetic poles intersecting the line-of-sight two times during therotation cycle. We intend to apply this method to a larger sample of HerbigAe/Be stars.

Spectroscopic signatures of magnetospheric accretion in Herbig Ae/Be stars. I. The case of HD101412