Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..946j&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
Ab Dor, Doppler Imaging, Mhd, Corona
Scientific paper
We use surface magnetic maps from Zeeman-Doppler imaging to extrapolate the coronal magnetic field of the young solar-like star AB Dor (Prot= 0.514 days). We assume that the coronal field is potential and find that much of the corona is filled with open magnetic field lines. We calculate the pressure and density within the corona, assuming that the gas is isothermal (T=107K) and in hydrostatic equilibrium. Using a Monte Carlo radiative transfer code we determine the X-ray emission measure and rotational modulation. We find that the open field regions can cause the observed rotational modulation of 5%-15% (Kürster et al. 1997) even for an optically thin corona that extends to over 3Rstar. The corona is highly structured with a low filling factor (0.1% to 1%). By varying the base density, we find that densities in excess of 1010cm-3 are needed to explain the observed emission measures of 1052-1053cm-3 (Vilhu et al. 2001).
Collier Cameron Andrew
Donati Jean-Francois
Jardine Moira M.
Wood Kathleen
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