论文标题
磁性二离子恒星在真空中旋转
Magnetic quadri-dipolar stars rotating in vacuum
论文作者
论文摘要
主要序列星和紧凑型物体（如白色矮人和中子星）通常嵌入到恒星中心位于恒星中心的纯偶极子的磁场中。偏离中心的偶极子有时可以更好地调整现有数据，并提供简单的几何图像以包括多极字段。但是，这种配置通常是限制性的，将多极组件限制为强度小于基础偶极子。在本文中，我们考虑了真空中偶极子和四极磁场关联给出的最一般的最低阶多极组合。遵循多极场计算的一般形式主义，我们在旋转四吡质吡喃之外得出了完整的电磁场。给出了po弹通量和电磁踢的精确分析表达式。这种几何形状可用于研究中子恒星的磁层，越来越引人注目的观察结果揭示了至少四边形磁场的提示。我们还表明，对于恒星表面的四极杆成分，印在中子恒星的电磁踢可以在出生时达到数千km/s。
Main sequence stars and compact objects like white dwarfs and neutron stars are usually embedded in magnetic fields that strongly deviate from a pure dipole located right at the stellar centre. An off-centred dipole can sometimes better adjust existing data and offer a simple geometric picture to include multipolar fields. However, such configurations are usually to restrictive, limiting multipolar components to strength less than the underlying dipole. In this paper, we consider the most general lowest order multipolar combination given by a dipole and a quadrupole magnetic field association in vacuum. Following the general formalism for multipolar field computations, we derive the full electromagnetic field outside a rotating quadridipole. Exact analytical expressions for the Poynting flux and the electromagnetic kick are given. Such geometry is useful to study the magnetosphere of neutron stars for which more and more compelling observations reveals hints for at least quadridipolar fields. We also show that for sufficiently high quadrupole components at the stellar surface, the electromagnetic kick imprinted to a neutron star can reach thousands of km/s for a millisecond period at birth.
