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2003MNRAS.345.1145D - Mon. Not. R. Astron. Soc., 345, 1145-1186 (2003/November-2)
Dynamo processes and activity cycles of the active stars AB Doradus, LQ Hydrae and HR 1099.
DONATI J.-F., COLLIER CAMERON A., SEMEL M., HUSSAIN G.A.J., PETIT P., CARTER B.D., MARSDEN S.C., MENGEL M., LOPEZ ARISTE A., JEFFERS S.V. and REES D.E.
Abstract (from CDS):
All of the magnetic images presented here indicate that large regions with predominantly azimuthal magnetic fields are continuously present at the surfaces of these stars. We take this as further evidence that the underlying dynamo processes that produce them are probably distributed throughout the entire convective zone (and not confined at its base, as in the Sun). We speculate that the radial and azimuthal field maps that we recover correspond, respectively, to the poloidal and toroidal components of the large-scale dynamo field.
We find, in particular, that some signatures, for instance the relative fraction of magnetic energy stored in the large-scale poloidal and toroidal field components, and the polarity of the axisymmetric component of the field, are variable with time, and provide potentially fruitful diagnostics for investigating magnetic cycles in active stars other than the Sun. We report here the detection of partial polarity switches in some of the axisymmetric field components of two of our programme stars (AB Dor and LQ Hya), suggesting that the dynamo operating in these stars may be cyclic.
Abstract Copyright: 2003 RAS
Journal keyword(s): line: profiles - stars: activity - binaries: close - stars: magnetic fields - stars: rotation - stars: spots
Simbad objects: 3
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