Oscillations of the Boundary Layer and High-frequency QPOs
Abstract
We observed persistent high-frequency oscillations of the boundary layer near an accreting, weakly-magnetized star in global 3D MHD simulations. The tilted dipole magnetic field is not strong enough to open a gap between the star and the disk. Instead, it forms a highly-wrapped azimuthal field near the surface of the star which slows down rotation of the disk matter, while a small tilt of the field excites oscillations of the boundary layer with a frequency below the Keplerian frequency. This mechanism may be responsible for the high-frequency oscillations in accreting neutron stars, white dwarfs and classical T Tauri stars.
- Publication:
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European Physical Journal Web of Conferences
- Pub Date:
- January 2014
- DOI:
- 10.1051/epjconf/20136405009
- arXiv:
- arXiv:1309.4383
- Bibcode:
- 2014EPJWC..6405009B
- Keywords:
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- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 4 pages, 3 figures, conference proceedings: "Physics at the Magnetospheric Boundary", Geneva, Switzerland, 25-28 June, 2013