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.
Cite
@article{arxiv.1309.4383,
title = {Oscillations of the Boundary Layer and High-frequency QPOs},
author = {A. A. Blinova and M. Bachetti and M. M. Romanova},
journal= {arXiv preprint arXiv:1309.4383},
year = {2015}
}
Comments
4 pages, 3 figures, conference proceedings: "Physics at the Magnetospheric Boundary", Geneva, Switzerland, 25-28 June, 2013