脉冲星具有极强的磁场，由于其磁轴与自转轴并不完全重合，这使脉冲星存在电磁辐射。脉冲星靠消耗自转能来弥补辐射出去的能量，从而导致自旋速度的逐渐放慢。根据理论推导，对蟹状星云脉冲星(Crab)的初始周期进行预测，并推导出在未来任意时刻，在电磁辐射的影响下，其脉冲星自旋周期的演化规律。由于脉冲星的质量分布可能存在四极矩，引力波辐射也会使得脉冲星的旋转速度减小，因此进一步分析Crab脉冲星在引力波影响下自旋周期的变化。最后将两种辐射机制模型结合，对脉冲星在两种辐射机制共同作用下自旋周期的演化进行分析。%Pulsars possess a strong magnetic field, and their magnetic axis is not coincident with their axis of rotation, which makes the existence of electromagnetic radiations. Pulsar’s rotational energy is able to compensate for the energy emitted by the electromagnetic radiations, which deduces a gradual slow down of the pulsar spin velocity. According to the theoretical derivation, we predict the initial period of the Crab Nebula pulsar, and derive the period evolution at any time in the future under the effect of electromagnetic radiations. Since there is a quadrupole deformation of the mass distribution of pulsars, the gravitational wave radiation will reduce the rotational speed of the pulsar. Hence, the influence of gravitational waves on the spin period of Crab pulsar is taken into account for a further analysis. Finally, two models of radiation mechanism are combined, and the evolution of spin period of the pulsar is studied.
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