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2008MNRAS.387..481D - Mon. Not. R. Astron. Soc., 387, 481-496 (2008/June-3)
The first magnetic maps of a pre-main-sequence binary star system - HD155555.
DUNSTONE N.J., HUSSAIN G.A.J., COLLIER CAMERON A., MARSDEN S.C., JARDINE M., STEMPELS H.C., RAMIREZ VELEZ J.C. and DONATI J.-F.
Abstract (from CDS):
Our radial magnetic maps reveal a complex surface magnetic topology with mixed polarities at all latitudes. We find rings of azimuthal field on both stars, most of which are found to be non-axisymmetric with the stellar rotational axis. We also examine the field strength and the relative fraction of magnetic energy stored in the radial and azimuthal field components at both epochs. A marked weakening of the field strength of the secondary star is observed between the 2004 and 2007 epochs. This is accompanied by an apparent shift in the location of magnetic energy from the azimuthal to radial field. We suggest that this could be indicative of a magnetic activity cycle. We use the radial magnetic maps to extrapolate the coronal field (by assuming a potential field) for each star individually - at present ignoring any possible interaction. The secondary star is found to exhibit an extreme tilt (~75°) of its large-scale magnetic field to that of its rotation axis for both epochs. The field complexity that is apparent in the surface maps persists out to a significant fraction of the binary separation. Any interaction between the fields of the two stars is therefore likely to be complex also. Modelling this would require a full binary field extrapolation.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): polarization - binaries: spectroscopic - stars: coronae - stars: imaging - stars: magnetic fields - stars: pre-main-sequence
Simbad objects: 9
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