Open AccessDynamics of magnetic flux tubes in accretion disks of Herbig Ae/Be stars
Author(s) -
Sergey A. Khaibrakhmanov,
A. E. Dudorov
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.048
Subject(s) - t tauri star , physics , astrophysics , stars , magnetic flux , accretion (finance) , herbig ae/be star , radiative transfer , turbulence , magnetic field , astronomy , mechanics , k type main sequence star , quantum mechanics
The dynamics of magnetic ux tubes (MFTs) in accretion disks of Herbig Ae/Be stars with fossil large-scale magnetic eldis modeled. The model takes into account the buoyant force, turbulent and aerodynamic drag, radiative heat exchange withthe surrounding gas, and the magnetic eld of the disk. The structure of the disk is calculated using our MHD model,taking into account the heating of the surface layers of the disk with the intense stellar radiation. The simulations showthat MFTs periodically rise from the disk with speeds of 10 − 12 km s −1 and form an outowing magnetized corona of thedisk. MFTs can experience magnetic oscillations under the action of the external magnetic eld near the disk’s surface. Weargue that the oscillations can produce observed IR-variability of Herbig Ae/Be stars, which would be more intense thanin the case of T Tauri stars, since the disks of Herbig Ae/Be stars are hotter, denser and have stronger magnetic eld.