CP星中的塞曼分裂线：在慢旋转体中发现低对比度场？
Zeeman split lines in CP stars: a discovery of low-contrast fields in slow rotators?
摘要：
我们表明，高分辨率观测解决塞曼分裂线可以用来获得新的恒星磁场几何约束。特别是，在恒星表面上的场强分布的对比度可以推导出从差分测量的π和西格玛塞曼分量的二阶矩。我们对缓慢旋转的冷磁性CP星中的三线态线的分析揭示了一个令人惊讶的均匀场结构，与任何低阶多极几何不一致。
英文摘要：
We show that high-resolution observations of resolved Zeeman split lines can be used to obtain new constraints on the stellar magnetic field geometry. In particular, the contrast of the field strength distribution over the stellar surface can be deduced from the differential measurement of the second moment of the pi and sigma Zeeman components. Our analysis of the triplet lines in slowly rotating cool magnetic CP stars uncovers a surprisingly homogeneous field structure, inconsistent with any low-order multipolar geometry.
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