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A fossil origin for the magnetic field in A stars and white dwarfs

机译：A星和白矮星中磁场的化石起源

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摘要

Some main-sequence stars of spectral type A are observed to have a strong (0.03 - 3 tesla), static, large-scale magnetic field, of a chiefly dipolar shape: they are known as 'Ap stars'(1-4), such as Alioth, the fifth star in the Big Dipper. Following the discovery of these fields, it was proposed that they are remnants of the star's formation, a 'fossil' field(5,6). An alternative suggestion is that they could be generated by a dynamo process in the star's convective core(7). The dynamo hypothesis, however, has difficulty explaining high field strengths and the observed lack of a correlation with rotation. The weakness of the fossil-field theory has been the absence of field configurations stable enough to survive in a star over its lifetime. Here we report numerical simulations that show that stable magnetic field configurations, with properties agreeing with those observed, can develop through evolution from arbitrary, unstable initial fields. The results are applicable equally to Ap stars, magnetic white dwarfs and some highly magnetized neutron stars known as magnetars. This establishes fossil fields as the natural, unifying explanation for the magnetism of all these stars.
机译：观察到某些光谱类型为A的主序星具有强（0.03-3特斯拉）静态大尺度磁场，主要为偶极子形状：它们被称为“ Ap星”（1-4），例如北斗七星中的第五颗星Alioth。在发现这些场之后，有人提出说它们是恒星形成的残余物，即“化石”场（5,6）。另一种建议是，它们可能是由恒星对流核心中的发电机过程产生的（7）。然而，发电机假说很难解释高场强，并且观察到与旋转之间没有相关性。化石场论的弱点在于缺乏足够稳定以在恒星中生存的恒星构型。在这里，我们报告的数值模拟表明，可以通过从任意，不稳定的初始场演化来发展出稳定的磁场结构，其性质与所观察到的性质一致。该结果同样适用于Ap星，磁性白矮星和一些高度磁化的中子星，称为磁星。这将化石场确立为所有这些恒星的磁性的自然统一解释。

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