论文标题
Herbig AE/BE恒星积聚磁盘中磁通管的动力学
Dynamics of magnetic flux tubes in accretion disks of Herbig Ae/Be stars
论文作者
论文摘要
考虑到浮力和阻力力，与周围气体的辐射热交换以及磁盘的磁场，对典型的Herbig ae/be star的吸积盘的动力学（MFT）进行了建模。考虑到使用恒星辐射对磁盘的表面层的加热，使用我们的磁性水力动力学（MHD）模型模拟了磁盘的结构。模拟表明，MFTS定期从磁盘的最内向区域上升，速度高达$ 10-12 $ km s $^{ - 1} $。在磁盘表面附近的外部磁场的作用下，MFT经历了磁振荡的经历。振荡周期随距离恒星和MFT的初始血浆β的距离增加，范围从$ r = 0.012 $ au到几个月，到$ r = 1 $ au。振荡的特征是MFT特性（包括温度）的脉动。我们认为，由于Herbig Ae/Be恒星的磁盘更热，磁场更浓重，并且具有更强的磁场，因此与T Tauri恒星相比，振荡可以产生观察到的Herbig ae/be stars的IR变异性，这比T Tauri恒星更强烈。
The dynamics of magnetic flux tubes (MFTs) in the accretion disk of typical Herbig Ae/Be star 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 (MHD) 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$^{-1}$. 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 up to several months at $r=1$ 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 Herbig Ae/Be stars, which would be more intense than in the case of T Tauri stars, since the disks of Herbig Ae/Be stars are hotter, denser and have stronger magnetic field.
