论文标题
在积聚中子星的扭矩逆转上
On the Torque Reversals of Accreting Neutron Stars
论文作者
论文摘要
我们已经扩展了早期提出的分析模型，以估算强螺旋体（SP）阶段积聚中子星的内部磁盘半径，以及强螺旋桨和弱螺旋桨（WP）阶段（Ertan 2017，2018）之间过渡到WP（带有旋转）和旋转（SU）和SU/SU/SU/SUPERS的旋转的条件。该模型可以解释这些系统的一些基本观察到的基本观察到的传统模型中没有预期的基本性能：（1）以低X射线亮度为恒星，并向SP阶段的过渡（无需增值）的过渡率低于旋转/旋转阶段的较大阶段（2）跨量范围（2），（2）在进行量的范围（2），（2）percretition（2）wwp（2），（2）wwp（2）WW。旋转和向下的相位具有可比的扭矩幅度，而质量流速率没有实质性变化。我们的结果表明，扭矩逆转两侧的扭矩的幅度与不同系统的旋转周期，磁偶极矩和积聚速率在过渡过程中的比率相似。我们模型中估计的扭矩逆转性能与观察到的扭矩逆转为4U 1626--67。
We have extended the analytical model proposed earlier to estimate the inner disk radius of accreting neutron stars in the strong-propeller (SP) phase, and the conditions for the transitions between the strong and weak propeller (WP) phases (Ertan 2017, 2018) to the WP (accretion with spin-down) and the spin-up (SU) phases, and the torque reversals during the WP/SU transitions. The model can account for some basic observed properties of these systems that are not expected in conventional models: (1) accretion on to the star at low X-ray luminosities and the transitions to the SP phase (no accretion) at critical accretion rates much lower than the rate required for the spin-up/spin-down transition, (2) ongoing accretion throughout a large range of accretion rates while the source is spinning down (WP phase), and (3) transitions between the spin-up and spin-down phases with comparable torque magnitudes, without substantial changes in the mass-flow rate. Our results indicate that the magnitudes of the torques on either side of the torque reversal have a ratio similar for different systems independently of their spin periods, magnetic dipole moments and accretion rates during the transitions. Estimated torque reversal properties in our model are in agreement with the observed torque reversals of 4U 1626--67.
