Modeling X-ray emission from stellar coronae
- Autori: GREGORY S G; JARDINE M; ARGIROFFI C; DONATI J-F
- Anno di pubblicazione: 2009
- Tipologia: eedings
- OA Link: http://hdl.handle.net/10447/48988
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 geometry 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 a 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.