2004年至2007年II Peg -磁场重组的Zeeman-多普勒成像
Zeeman-Doppler Imaging of II Peg - Magnetic field restructuring from 2004 to 2007
摘要：
我们目前的塞曼多普勒图像的活跃的K2星II钉为2004年和2007年。利用我们的新ZDI代码“iMap”重建了表面磁场，该代码提供了全极化辐射转移驱动的反演，以同时重建表面温度和磁矢量场分布。II Peg在这两年都显示出显著的大尺度磁场结构。磁场主要位于高纬度地区，并以活跃的带状排列。磁场结构的戏剧性演变在这两年是可见的，其中2004年占主导地位的和主要的单极场已经发展成两个不同的和大规模的双极结构在2007年。
英文摘要：
We present Zeeman-Doppler images of the active K2 star II Peg for the years 2004 and 2007. The surface magnetic field was reconstructed with our new ZDI code "iMap" which provides a full polarized radiative transfer driven inversion to simultaneously reconstruct the surface temperature and magnetic vector field distribution. II Peg shows a remarkable large scale magnetic field structure for both years. The magnetic field is predominantly located at high latitudes and is arranged in active longitudes. A dramatic evolution in the magnetic field structure is visible for the two years, where a dominant and largely unipolar field in 2004 has developed into two distinct and large scale bipolar structures in 2007.
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