3D MHD simulations of accretion on to stars with tilted magnetic and rotational axes

3D MHD simulations of accretion on to stars with tilted magnetic and rotational axes
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具有倾斜磁轴和旋转轴的恒星吸积的 3D MHD 模拟

DOI:
10.1093/mnras/stab1724
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发表时间:
2021
影响因子:
4.8
通讯作者:
Lovelace, R V
Lovelace, R V
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Romanova, M M;Koldoba, A V;Ustyugova, G V;Blinova, A A;Lai, D;Lovelace, R V

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我们给出了对磁化恒星吸积的全球三维磁流体动力学模拟结果,其中恒星的磁轴和旋转轴都围绕圆盘的旋转轴倾斜。我们观察到,最初,由于磁层和圆盘之间的磁相互作用,圆盘的内部部分是弯曲的,倾斜的和进动的。随后,随着恒星磁矩的增大,更大的倾斜圆盘形成。圆盘的法向量以不同角度倾斜,从~ 5°-10°到~ 30°-40°。小的倾斜可能是由于围绕恒星旋转轴的磁力线的缠绕和倾向于使圆盘对齐的磁力的作用造成的。另一种可能的解释是磁巴丁-彼得森效应,在这种效应中,由于圆盘上的岁差和粘性扭矩,圆盘沉降在恒星的赤道平面上。倾斜圆盘在参考半径(约3个恒星半径)上以约50个开普勒周期的时间尺度缓慢前进。我们的结果可以应用于不同类型的恒星,在那里已经观察到倾斜盘和/或缓慢进动的迹象。
We present results of global 3D magnetohydrodynamic simulations of accretion on to magnetized stars where both the magnetic and rotational axes of the star are tilted about the rotational axis of the disc. We observed that initially the inner parts of the disc are warped, tilted, and precess due to the magnetic interaction between the magnetosphere and the disc. Later, larger tilted discs form with the size increasing with the magnetic moment of the star. The normal vector to the discs are tilted at different angles, from ∼5°–10° up to ∼30°–40°. Small tilts may result from the winding of the magnetic field lines about the rotational axis of the star and the action of the magnetic force which tends to align the disc. Another possible explanation is the magnetic Bardeen–Petterson effect in which the disc settles in the equatorial plane of the star due to precessional and viscous torques in the disc. Tilted discs slowly precess with the time-scale of the order of ∼50 Keplerian periods at the reference radius (∼3 stellar radii). Our results can be applied to different types of stars where signs of tilted discs and/or slow precession have been observed.
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发表时间: 1997-02
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发表时间: 2008
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发表时间: 2010
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DOI: 10.1134/s1063772910120012
发表时间: 2010-10
期刊: Astronomy Reports
影响因子: 1
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