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THERMALLY DRIVEN NEUTRON STAR GLITCHES

机译:热驱动中子星故障

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We examine the thermal and dynamical response of a neutron star to a sudden perturbation of the inner crust temperature. During the star's evolution, starquakes and other processes may deposit approx> 10~(42) ergs, causing significant internal heating and increased frictional coupling between the crust and the more rapidly rotating neutron superfluid the star is expected to contain. Through numerical simulation we study the propagation of the thermal wave created by the energy deposition, the induced motion of the interior superfluid, and the resulting spin evolution of the crust. We find that energy depositions of ~10~(40) ergs produce gradual spin-ups above the timing noise level, while larger energy depositions produce sudden spin jumps resembling pulsar glitches. For a star with a temperature in the observed range of the Vela pulsar, an energy deposition of ~10~(42) ergs produces a large spin-up taking place over minutes, similar to the Vela "Christmas" glitch. Comparable energy deposition in a younger and hotter "Crab-like" star produces a smaller spin-up taking place over ~1~d, similar to that seen during the partially time-resolved Crab glitch of 1989.
机译:我们研究了中子星对内部地壳温度突然扰动的热动力响应。在恒星的演化过程中,恒星和其他过程可能会沉积大约10〜(42)erg,从而导致内部明显发热,并使地壳与预期包含该恒星的中子超流体之间的摩擦耦合增加。通过数值模拟,我们研究了由能量沉积产生的热波的传播,内部超流体的诱导运动以及地壳的自旋演化。我们发现〜10〜(40)erg的能量沉积会在定时噪声水平以上产生逐渐的自旋,而较大的能量沉积会产生类似于脉冲星毛刺的突然自旋跳跃。对于温度处于Vela脉冲星观测范围内的恒星,能量沉积〜10〜(42)ergs会在几分钟内产生较大的自旋,类似于Vela“圣诞节”故障。在更年轻,更热的“蟹状”恒星中,可比的能量沉积在〜1d内产生了较小的自旋,类似于1989年在时间上部分解决的蟹状故障中所看到的。

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