Modeling the Corona of AB Doradus
G.A.J. Hussain, A.A. van Ballegooijen, M. Jardine, A. Collier Cameron
Institute:
Harvard-Smithsonian Center for Astrophysics
Institute:
School of Physics and Astronomy, University of St Andrews
Contact Email: ghussain@cfa.harvard.edu
Abstract:
We present a model for the coronal topology of the active, rapidly
rotating K0 dwarf, AB Doradus.
Surface magnetic field maps obtained using a technique based on Zeeman
Doppler imaging indicate the presence of a strong non-potential component
near the pole of the star. The coronal topology is obtained by
extrapolating these surface maps.
The temperature and density
in the corona are evaluated using an energy balance model.
Emission measure distributions computed using our models compare
favorably with observations.
However, the electron density observed by EUVE,
approxmately 10^13 cm-3,
at the emission measure peak temperature of
8 MK remains difficult to explain satisfactorily.
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Manuscript submitted: 2001-September-10
"The Future of Cool-Star Astrophysics', 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.