论文标题
在PSR B0950+08的特殊旋转演变上
On the Peculiar Rotational Evolution of PSR B0950+08
论文作者
论文摘要
旧的，孤立的脉冲星的长期旋转演变，PSR B0950+08引人入胜，因为其旋转速率显示出由于交替变化而在大小和符号中，脉冲频率的第二个时间衍生物的交替变化引起的正弦状振荡。我们表明，较大的内部温度与固定能量比与最近的高表面温度测量PSR B0950+08所隐含的地壳底部相同，从而导致涡流线和固定位点之间的线性蠕变相互作用在此PULSAR中运行。涡流线假定抛物线形状，因为固定在核簇上，并且涡旋的有限张力充当恢复力，往往会使涡流恢复到其直形状。涡流线的低频振荡与内部超流体组件与外部脉冲星制动扭矩之间的时间变量耦合相结合，导致了振荡性的旋转速率。我们将此模型应用于几种外部扭矩模型的PSR B0950+08观测值。我们的模型有可能从旋转速率的振荡周期中限制中子恒星外核外核的封闭磁场区域的径向延伸。
The long-term rotational evolution of the old, isolated pulsar, PSR B0950+08 is intriguing in that its spin-down rate displays sinusoidal-like oscillations due to alternating variations, both in magnitude and sign, of the second time derivative of the pulse frequency. We show that the large internal temperature to pinning energy ratio towards the base of the crust implied by the recent high surface temperature measurement of PSR B0950+08 leads to linear creep interaction between vortex lines and pinning sites to operate in this pulsar. Vortex lines assume a parabolic shape due to pinning to nuclear clusters and finite tension of vortices acts as a restoring force that tends to bring a vortex back to its straight shape. The resulting low frequency oscillations of vortex lines combined with the time variable coupling between the internal superfluid components and the external pulsar braking torque give rise to an oscillatory spin-down rate. We apply this model to PSR B0950+08 observations for several external torque models. Our model has potential to constrain the radial extension of the closed magnetic field region in the outer core of neutron stars from the oscillation period of the spin-down rate.
