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http://elar.urfu.ru/handle/10995/117822
Title: | Dynamics of magnetic flux tubes in accretion disks of Herbig Ae/Be stars |
Authors: | Khaibrakhmanov, S. A. Dudorov, A. E. |
Issue Date: | 2022 |
Publisher: | De Gruyter Open Ltd |
Citation: | Khaibrakhmanov S. A. Dynamics of magnetic flux tubes in accretion disks of Herbig Ae/Be stars / S. A. Khaibrakhmanov, A. E. Dudorov // Open Astronomy. — 2022. — Vol. 31. — Iss. 1. — P. 125-135. |
Abstract: | The dynamics of magnetic flux tubes (MFTs) in the accretion disk of typical Herbig Ae/Be star (HAeBeS) with fossil large-scale magnetic field is modeled taking into account the buoyant and drag forces, radiative heat exchange with the surrounding gas, and the magnetic field of the disk. The structure of the disk is simulated using our magnetohydrodynamic model, taking into account the heating of the surface layers of the disk with the stellar radiation. The simulations show that MFTs periodically rise from the innermost region of the disk with speeds up to 10-12 km s - 1 {{\rm{s}}}^{-1}. MFTs experience decaying magnetic oscillations under the action of the external magnetic field near the disk's surface. The oscillation period increases with distance from the star and initial plasma beta of the MFT, ranging from several hours at r = 0.012 au r=0.012\hspace{0.33em}{\rm{au}} up to several months at r = 1 au r=1\hspace{0.33em}{\rm{au}}. The oscillations are characterized by pulsations of the MFT's characteristics including its temperature. We argue that the oscillations can produce observed IR-variability of HAeBeSs, which would be more intense than in the case of T Tauri stars, since the disks of HAeBeSs are hotter, denser, and have stronger magnetic field. © 2022 Sergey A. Khaibrakhmanov and Alexander E. Dudorov, published by De Gruyter. |
Keywords: | ACCRETION DISCS HERBIG AE/BE ISM: MAGNETIC FIELDS MHD STARS: VARIABLES: T TAURI |
URI: | http://elar.urfu.ru/handle/10995/117822 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 85127911284 |
WOS ID: | 000773661400001 |
PURE ID: | 29936629 |
ISSN: | 25436376 |
DOI: | 10.1515/astro-2022-0017 |
metadata.dc.description.sponsorship: | Russian Science Foundation, RSF: 19-72-10012 Funding information : This work was supported by the Russian Science Foundation (project 19-72-10012) |
RSCF project card: | 19-72-10012 |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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