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Paper: Probing the Structure of the Accretion Region in a Sample of Magnetic Herbig Ae/Be Stars
Volume: 494, Physics and Evolution of Magnetic and Related Stars
Page: 175
Authors: Pogodin, M. A.; Cahuasqui, J. A.; Drake, N. A.; Hubrig, S.; Schöller, M.; Petr-Gotzens, M.; Franco, G. A. P.; Lopes, D. F.; Kozlova, O. V.; Wolff, B.; González, J. F.; Carroll, T. A.; Mysore, S.
Abstract: We present the results of a study of the temporal behavior of several diagnostic lines formed in the region of the accretion-disk/star interaction in the three magnetic Herbig Ae stars HD 101412, HD 104237, and HD 190073. More than 100 spectra acquired with the ISAAC, X-shooter, and CRIRES spectrographs installed at the 8-m VLT telescope (ESO, Chile), as well as at other observatories (OHP, Crimean AO) were analyzed. The spectroscopic data were obtained in the He I λ10 830, Paγ, and He I λ5876 lines. We found that the temporal behavior of the diagnostic lines in the spectra of all program stars can be widely explained by a rotational modulation of the line profiles, generated by a local accretion flow. This result is in good agreement with the predictions of the magnetospheric accretion model. For the first time, the rotation period of HD 104237 (Prot = 5.37±0.03 days) as well as the inclination angle (i = 21°±4°) were determined. Additional analysis of the HARPSpol spectra of HD 104237 and HD 190073, taken from the ESO archive, with the use of the SVD method shows that the magnetic field structure of HD 190073 is likely more complex than a simple dipole and contains a circumstellar component. For the first time, the magnetic field of the secondary component of the binary system HD 104237 was also detected ((Bz) = 128±10 G).
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