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2011MNRAS.417.1747D - Mon. Not. R. Astron. Soc., 417, 1747-1759 (2011/November-1)
The close classical T Tauri binary V4046 Sgr: complex magnetic fields and distributed mass accretion.
DONATI J.-F., GREGORY S.G., MONTMERLE T., MAGGIO A., ARGIROFFI C., SACCO G., HUSSAIN G., KASTNER J., ALENCAR S.H.P., AUDARD M., BOUVIER J., DAMIANI F., GUDEL M., HUENEMOERDER D. and WADE G.A.
Abstract (from CDS):
Applying our tomographic imaging tools to the collected data set, we reconstruct maps of the large-scale magnetic field, photospheric brightness and accretion-powered emission at the surfaces of both stars of V4046 Sgr. We find that these fields include significant toroidal components, and that their poloidal components are mostly non-axisymmetric with a dipolar component of 50–100 G strongly tilted with respect to the rotation axis; given the similarity with fields of partly convective main-sequence stars of similar masses and rotation periods, we conclude that these fields are most likely generated by dynamo processes. We also find that both stars in the system show cool spots close to the pole and extended regions of low-contrast, accretion-powered emission; it suggests that mass accretion is likely distributed rather than confined in well-defined high-contrast accretion spots, in agreement with the derived magnetic field complexity.
Abstract Copyright: 2011 The Authors. Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): techniques: polarimetric - stars: formation - stars: imaging - stars: individual: V4046 Sgr - stars: magnetic fields - stars: rotation
Simbad objects: 9
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