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Number of entries: 1

23
April 2021

Stellar magnetic fields: stability and dynamos


Start: 12:00h
Speaker: Fabio del Sordo (Foundation for Research and Technology (FORTH), Crete, Greece & Department of Physics and ITCP, University of Crete, Greece)
Place: Zoom: https://us02web.zoom.us/j/85044910172?pwd=bXRmeWx3cTdDSzkrMFFJUXI5eE9hQT09 Meeting ID: 850 4491 0172 Passcode: 996691

The evolution of stellar magnetism is one of the main problems of modern astrophysics, as it affects directly both stellar evolution and their hosted planetary system. I will present some recent studies about the stability evolution of magnetic fields in the interior of radiative stars. In the first…
Start: 12:00h
Speaker: Fabio del Sordo (Foundation for Research and Technology (FORTH), Crete, Greece & Department of Physics and ITCP, University of Crete, Greece)
Place: Zoom: https://us02web.zoom.us/j/85044910172?pwd=bXRmeWx3cTdDSzkrMFFJUXI5eE9hQT09 Meeting ID: 850 4491 0172 Passcode: 996691

The evolution of stellar magnetism is one of the main problems of modern astrophysics, as it affects directly both stellar evolution and their hosted planetary system. I will present some recent studies about the stability evolution of magnetic fields in the interior of radiative stars. In the first part of the seminar I will present results illustrating how a general stellar magnetic field is unstable, but under some conditions can be at least marginally stabilized. In particular, I will present results related to the stability of toroidal fields and the instability associated with them, namely the Tayler instability. These results have direct application to Ap/Bp stars, which are known to host magnetic fields of the order or superior to 300G. I will also show some new results about the effect induced by stellar rotation on magnetic field stability. In the second part, I will present dynamo simulations modelling the evolved AP star EK Eridani. This is the most slowly rotating active giant star known and it exhibits a very well organized magnetic field whose origin is still debated: it could be either a remnant of field developed in earlier evolutionary stages or the result of present dynamo action. I will show how the possibility of having dynamo action in EK Eridani depends on internal differential rotation. 
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An institute of the Consejo Superior de Investigaciones Científicas
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