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arXiv 1004.0385astro-ph.HE
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具有复杂磁场的旋转恒星的单侧流出/喷流

One-sided Outflows/Jets from Rotating Stars with Complex Magnetic Fields

R. V. E. Lovelace, M. M. Romanova, G. V. Ustyugova, A. V. Koldoba

摘要:

我们研究了产生本质上不对称或{ \it单侧}流出或喷流从磁盘吸积到旋转的恒星与复杂的磁场使用轴对称(2.5 D)磁流体动力学模拟。假设恒星的内禀磁场是由一个排列整齐的偶极子和一个排列整齐的四极子以不同的比例叠加而成。恒星被认为是快速旋转的意义上说,恒星的磁层是在螺旋桨制度的强烈外流发生。我们的模拟结果表明,除了偶极分量,还有一个显着的四极分量的条件下,然后一个占主导地位的{ \it单侧}锥形风倾向于形成在赤道面的一侧,在给定的距离内的轴向磁场的较大值。对于四极分量是不存在的或非常小的情况下,我们发现,占主导地位的单边流出也形成,但流动的方向“触发器”之间的向上和向下的时间尺度上的$\sim 30$天的原恒星。因此,平均流出量将是对称的。在一个纯四极场的情况下,我们发现对称流出的向上和向下的方向。

英文摘要:

We investigate the generation of intrinsically asymmetric or {\it one-sided} outflows or jets from disk accretion onto rotating stars with complex magnetic fields using axisymmetric (2.5D) magnetohydrodynamic simulations. The intrinsic magnetic field of the star is assumed to consist of a superposition of an aligned dipole and an aligned quadrupole in different proportions. The star is assumed to be rapidly rotating in the sense that the star's magnetosphere is in the propeller regime where strong outflows occur. Our simulations show that for conditions where there is a significant quadrupole component in addition to the dipole component, then a dominantly {\it one-sided} conical wind tends to form on the side of the equatorial plane with the larger value of the intrinsic axial magnetic field at a given distance. For cases where the quadrupole component is absent or very small, we find that dominantly one-sided outflows also form, but the direction of the flow "flip-flops" between upward and downward on a time-scale of $\sim 30$ days for a protostar. The average outflow will thus be symmetrical. In the case of a pure quadrupole field we find symmetric outflows in the upward and downward directions.

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