标题： 恒星内部的稳定磁场 显示英文标题

标题： Stable magnetic fields in stellar interiors

摘要： 我们研究了存在了50年之久的假设，即天文学中的Ap星磁场是自这些恒星形成以来一直存在的稳定平衡态。 通过数值模拟，我们发现确实存在在恒星辐射内部条件下稳定的磁场配置。 证实了Prendergast（1956）的假设，这些配置具有大致相等的轴向和环向磁场强度。 我们发现这种扭曲场的环状结构可以作为不稳定随机初始场衰减后的遗迹而形成。 与观测结果一致，表面磁场呈现近似偶极子形态，高阶多极贡献较小，并且表面磁场强度会随着恒星年龄的增长而增强。 本文的结果由Braithwaite & Spruit（2004）进行了总结。 显示英文摘要

摘要： We investigate the 50-year old hypothesis that the magnetic fields of the Ap stars are stable equilibria that have survived in these stars since their formation. With numerical simulations we find that stable magnetic field configurations indeed appear to exist under the conditions in the radiative interior of a star. Confirming a hypothesis by Prendergast (1956), the configurations have roughly equal poloidal and toroidal field strengths. We find that tori of such twisted fields can form as remnants of the decay of an unstable random initial field. In agreement with observations, the appearance at the surface is an approximate dipole with smaller contributions from higher multipoles, and the surface field strength can increase with the age of the star. The results of this paper were summarised by Braithwaite & Spruit (2004).