Why the braking indices of young pulsars are less than 3
Why the braking indices of young pulsars are less than 3
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为什么年轻脉冲星的制动指数小于3
DOI：
10.1051/0004-6361:200600019
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发表时间：
2006-03
影响因子：
6.5
通讯作者：
中科院分区：
文献类型：
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作者：
本文讨论了导致观测到的年轻射电脉冲星制动指标n小于3的两个可能原因：(a)磁场分量$B_{\perp}$的演化自旋下降模型随时间增加；(b)外部制动力矩模型，其中潮汐力矩由退盘施加于脉冲星，带走了脉冲星的自旋角动量。在简单假设的基础上，推导出了脉冲星制动指标的表达式，并计算了脉冲星在不同输入参数下的自旋向下演化轨迹。
In this letter we discuss two possible reasons which cause the observed braking indices n of young radio pulsars to be smaller than 3: (a) the evolving spin-down model of the magnetic field component $B_{\perp}$ increases with time; (b) the extrinsic braking torque model in which the tidal torques exerted on the pulsar by the fallback disk, and carries away the spin angular momentum from the pulsar. Based on some simple assumptions, we derive the expression of the braking indices, and calculate the spin-down evolutionary tracks of pulsars for different input parameters.