By extrapolating from observationally derived surface magnetograms of low-mass stars we construct models of their coronal magnetic fields and compare the 3D field geometries with axial multipoles. AB Dor, which has a radiative core, has a very complex field, whereas V374 Peg, which is completely convective, has a simple dipolar field. We calculate global X-ray emission measures assuming that the plasma trapped along the coronal loops is in hydrostatic equilibrium and compare the differences between assuming isothermal coronae, or by considering loop temperature profiles. Our preliminary results suggest that the non-isothermal model works well for the complex field of AB Dor, but not for the simple field of V374 Peg.

Gregory, S.G., Jardine, M., Argiroffi, C., Donati, J.F. (2009). Modeling X-ray Emission From The Coronae Of Low Mass Stars. In American Astronomical Society, AAS Meeting #213, #314.01; Bulletin of the American Astronomical Society.

Modeling X-ray Emission From The Coronae Of Low Mass Stars

ARGIROFFI, Costanza;
2009-01-01

Abstract

By extrapolating from observationally derived surface magnetograms of low-mass stars we construct models of their coronal magnetic fields and compare the 3D field geometries with axial multipoles. AB Dor, which has a radiative core, has a very complex field, whereas V374 Peg, which is completely convective, has a simple dipolar field. We calculate global X-ray emission measures assuming that the plasma trapped along the coronal loops is in hydrostatic equilibrium and compare the differences between assuming isothermal coronae, or by considering loop temperature profiles. Our preliminary results suggest that the non-isothermal model works well for the complex field of AB Dor, but not for the simple field of V374 Peg.
Settore FIS/05 - Astronomia E Astrofisica
2009
213th AAS Meeting
Long Beach, CA
4-8 Gennaio 2009
2009
00
http://adsabs.harvard.edu/abs/2009AAS...21331401G
Gregory, S.G., Jardine, M., Argiroffi, C., Donati, J.F. (2009). Modeling X-ray Emission From The Coronae Of Low Mass Stars. In American Astronomical Society, AAS Meeting #213, #314.01; Bulletin of the American Astronomical Society.
Proceedings (atti dei congressi)
Gregory, Scott G.; Jardine, M.; Argiroffi, C.; Donati, J. F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/48986
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