We present the results of a search for the magnetic field inhomogeneity for the red giant ϵ Tau. This research is based on observations obtained over 10 nights in 2008–2010 with the ESPaDOnS CFHT spectropolarimeter. We found a previously undescribed instrumental effect in the ESPaDOnS spectra, consisting of random polarization outliers. Therefore, to measure the magnetic field from the unblended individual lines, we preliminarily cleared the initial array of spectral lines from the lines distorted by polarization outliers. On only one date from 10, the magnetic field of ϵ Tau was found to exceed 3σ. We also revealed that during two nights the time series of the magnetic field values shows a distribution that is different from the normal distribution. A hypothesis was put forward that this may be due to the inhomogeneity of the magnetic field of this star.

中文翻译：

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朝向拥有行星的红巨星 eps Tau 的全球磁场

我们展示了搜索红巨星ϵ Tau的磁场不均匀性的结果。本研究基于 2008-2010 年使用 ESPaDOnS CFHT 分光偏振计在 10 个晚上获得的观测结果。我们在 ESPaDOnS 光谱中发现了以前未描述的仪器效应，由随机偏振异常值组成。因此，为了测量来自未混合的单条线的磁场，我们初步清除了由偏振异常值扭曲的线中的初始谱线阵列。仅在 10 年的某一天，发现ϵ Tau的磁场超过 3 σ. 我们还发现，在两个晚上，磁场值的时间序列显示出与正态分布不同的分布。提出了一种假设，认为这可能是由于这颗恒星的磁场不均匀所致。