Magnetorotational instability in Ap star envelopes
Abstract
The rotational evolution of the radiative zone of magnetic Ap stars is investigated with numerical simulations. An angular-velocity profile decreasing with axis distance in combination with a magnetic field leads to a magnetorotational instability. The resulting flows efficiently transport angular momentum outwards. The corresponding decay of angular-velocity gradients in the radiative zone is estimated to take about 10-100 million years.
- Publication:
-
The A-Star Puzzle
- Pub Date:
- December 2004
- DOI:
- 10.1017/S1743921304004430
- Bibcode:
- 2004IAUS..224..103A
- Keywords:
-
- MHD;
- instabilities;
- stars: rotation