Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....3102119j&link_type=abstract
American Astronomical Society, SPD Meeting #31, #021.19; Bulletin of the American Astronomical Society, Vol. 32, p.1290
Astronomy and Astrophysics
Astronomy
Scientific paper
Over the last few years, Zeeman-Doppler images of rapidly-rotating solar-like stars have shown that these stars do not simply have a scaled-up version of the solar magnetic field. Both AB Dor (a K0V dwarf, rotation period 12.5 hours) and LQ Hya (a K0V dwarf, rotation period 1.6 days) show a surface azimuthal field which is of the same strength as the radial field and which forms a unidirectional band at high latitudes. We present the results of extrapolating these surface fields into the corona under the assumption that the field is potential. We use the surface radial field to determine the potential azimuthal field and cross-correlate it with the observed azimuthal field. The cross-correlation is good at low latitudes, but fails above latitude 60 degrees where the unidirectional azimuthal band cannot be represented by a potential field. We focus on the structure of the coronal field, in particular the regions of open field where the stellar wind may escape, and the regions of closed field which may support slingshot prominences.
Collier Cameron Andrew
Donati Jean-Francois
Jardine Moira M.
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