Impact of an axisymmetric magnetic field on gravity waves in rapidly rotating stars

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• Vincent Prat (CEA Saclay)
• Monday 19 November 2018, 14:00-15:00
• MR14, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Dr William Béthune.

Internal gravity waves provide us with a unique way to probe the stellar interior of intermediate-mass and massive stars. Those waves are also able to transport angular momentum. However, the propagation, the frequencies of waves and the transport they induce may be strongly affected by rotation and the presence of a magnetic field. For slow rotators, rotation can be taken into account using perturbative methods. For rapid rotators, which is the case of many early-type pulsators such as gamma Doradus, delta Scuti, SPB and Be stars, such methods fail, and the eigenvalue problem is fully 2D. To investigate the effect of an axisymmetric magnetic field on gravito-inertial waves, we use the ray theory, which describes small-wavelength waves as propagating rays. This method allows us to efficiently explore the parameter space and identify different wave behaviours in presence of a magnetic field.

This talk is part of the DAMTP Astrophysics Seminars series.

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