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• W3100953824 startingPage "1364" @default.
• W3100953824 abstract "We have modelled the X-ray emission from the young rapid rotator AB Doradus (Prot= 0.514 d) using as a basis Zeeman–Doppler maps of the surface magnetic field. This allows us to reconcile the apparently conflicting observations of a high X-ray emission measure and coronal density with a low rotational modulation in the X-ray band. The technique is to extrapolate the coronal field from the surface maps by assuming the field to be potential. We then determine the coronal density for an isothermal corona by solving hydrostatic equilibrium along each field line and scaling the surface plasma pressure with the surface magnetic pressure. We set the density to zero along those field lines that are open and those where at any point along their length the plasma pressure exceeds the magnetic pressure. We then calculate the optically thin X-ray emission measure and rotational modulation for models with a range of coronal densities. Although the corona can be very extended, much of the emission comes from high-latitude regions close to the stellar surface. Since these are always in view as the star rotates, there is little rotational modulation. We find that emission measures in the observed range 1052.8–1053.3 cm−3 can be reproduced with densities in the range 109–1010.7 cm−3 for coronae at temperatures of 106–107 K." @default.
• W3100953824 created "2020-11-23" @default.
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• W3100953824 date "2002-11-11" @default.
• W3100953824 modified "2023-09-26" @default.
• W3100953824 title "Inferring X-ray coronal structures from Zeeman-Doppler images" @default.
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• W3100953824 doi "https://doi.org/10.1046/j.1365-8711.2002.05877.x" @default.
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