通过相干射电发射的宽带观测揭开B星HD 133880的复杂磁层
Unraveling the complex magnetosphere of the B star HD 133880 via wideband observation of coherent radio emission
摘要：
HD 133880是六颗已知通过电子回旋脉泽发射（ECME）过程产生相干脉冲射电辐射的热磁星之一。在本文中，我们提出了一个广泛的频率范围内，覆盖近300 - 4000兆赫的巨型米波射电望远镜（GMRT）和卡尔G。Jansky甚大阵列（VLA）这项研究是同类研究中的第一项，发现了该现象和宿主恒星的几个有趣特征。我们发现，ECME脉冲的可观察到的属性，例如右和左圆偏振脉冲之间的时间延迟，脉冲的幅度，和它们的上限截止频率似乎是依赖于恒星的方向相对于视线。我们认为，所有这些现象，这是超出了理想的图片，可以归因于一个高度的方位角不对称的物质分布在磁层的磁场轴，这是一个结果的两个高旋转轴（旋转轴和磁场轴之间的角度）的恒星和恒星磁场偏离偶极拓扑结构。
英文摘要：
HD 133880 is one of the six hot magnetic stars known to produce coherent pulsed radio emission by the process of electron cyclotron maser emission (ECME). In this paper, we present observations of ECME from this star over a wide frequency range, covering nearly 300 - 4000 MHz with the Giant Metrewave Radio Telescope (GMRT) and the Karl G. Jansky Very Large Array (VLA). This study, which is the first of its kind, has led to the discovery of several interesting characteristics of the phenomenon and also of the host star. We find that the observable properties of ECME pulses, e.g. the time lag between right and left circularly polarized pulses, the amplitudes of the pulses, and their upper cut-off frequencies appear to be dependent on the stellar orientation with respect to the line of sight. We suggest that all these phenomena, which are beyond the ideal picture, can be attributed to a highly azimuthally asymmetric matter distribution in the magnetosphere about the magnetic field axis, which is a consequence of both the high obliquity (the angle between rotation axis and the magnetic field axis) of the star and the deviation of the stellar magnetic field from a dipolar topology.
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