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Probing the Structure of the Accretion Region in a Sample of Magnetic Herbig Ae/Be Stars | | M.A. Pogodin
; J.A. Cahuasqui
; N.A. Drake
; S. Hubrig
; M. Schoeller
; M. Petr-Gotzens
; G.A.P. Franco
; D.F. Lopes
; O.V. Kozlova
; B. Wolff
; J.F. Gonzalez
; T.A. Carroll
; S. Mysore
; | | Date: |
23 Oct 2014 | | Abstract: | We present the results of a study of the temporal behaviour of several
diagnostic lines formed in the region of the accretion-disk/star interaction in
the three magnetic Herbig Ae stars HD101412, HD104237, and HD190073. More than
100 spectra acquired with the ISAAC, X-shooter, and CRIRES spectrographs
installed at the VLT-8m telescope (ESO, Chile), as well as at other
observatories (OHP, Crimean AO) were analyzed. The spectroscopic data were
obtained in the He I lambda10830, Pa gamma and He I lambda5876 lines. We found
that the temporal behaviour 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 HD104237 (P_rot = 5.37+-0.03 days), as well as the
inclination angle (i = 21+-4deg) were determined. Additional analysis of the
HARPSpol spectra of HD104237 and HD190073, taken from the ESO archive, with the
use of the SVD method shows that the magnetic field structure of HD190073 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 HD104237 was also detected (<B_z> = 128+-10G). | | Source: | arXiv, 1410.6463 | | Services: | Forum | Review | PDF | Favorites | |
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