对FK Com上磁场的首次测量及其与同期星点位置的关系
First measurement of the magnetic field on FK Com and its relation to the contemporaneous starspot locations
摘要：
在这项研究中，我们提出了同时低分辨率的纵向磁场测量和高分辨率的光谱观测的冷单巨FK Com。磁场在2.4天的旋转周期的变化进行了比较，使用多普勒成像技术，V-波段测光和V-I颜色获得的星点位置。利用高分辨率的H α、H β和H γ谱线观测资料，在研究光球活动的同时，也研究了色球活动。平均纵向磁场的最大值（272 +/- 24 G）和最小值（60 +/- 17 G）都<Bz>是在恒星表面出现冷点的相位附近检测到的。对这种行为的一种可能的解释是，在相位相差0.2的两个双极上的有源区具有相反的极性。
英文摘要：
In this study we present simultaneous low-resolution longitudinal magnetic field measurements and high-resolution spectroscopic observations of the cool single giant FK Com. The variation of the magnetic field over the rotational period of 2.4 days is compared with the starspot location obtained using Doppler imaging techniques, V-band photometry and V-I colours. The chromospheric activity is studied simultaneously with the photospheric activity using high resolution observations of the Halpha, Hbeta and Hgamma line profiles. Both the maximum (272 +/- 24 G) and minimum (60 +/- 17 G) in the mean longitudinal magnetic field, <Bz>, are detected close to the phases where cool spots appear on the stellar surface. A possible explanation for such a behaviour is that the active regions at the two longitudes separated by 0.2 in phase have opposite polarities.
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