Cet k的高分辨率分光偏振：年轻太阳的代理
High-resolution spectropolarimetric of k Cet: A proxy for the young Sun
摘要：
在对太阳进行的时间k Cet（HD 20630）的太阳代理研究中，它可能具有非常接近太阳的质量和年轻的年龄。在这项研究中，我们监测的磁场和色球活动的Ca II H & K线的k Cet。我们使用最小二乘解卷积（LSD，Donati等，1997），同时提取包含在所有8,000个光球线的阶梯光栅（K1型恒星）的信息。为了重建一个可靠的磁图和表征的表面差异旋转的k Cet，我们使用了14个曝光分布在2个月内，以覆盖至少两个旋转周期（Prot ~ 9.2天）。LSD技术被应用于检测我们的14个观测值中的每一个的磁场的塞曼签名，并测量其纵向分量。为了重建k Cet的磁场几何形状，我们应用了塞曼多普勒成像（ZDI）反演方法。ZDI揭示了径向磁场中由极磁点组成的结构。在这项研究中，我们提出了一个高分辨率的分光偏振运动的fisrt看结果，以表征活动和磁场的这个年轻的太阳代理。
英文摘要：
Among the solar proxies studied in the Sun in Time k Cet (HD 20630) stands out as potentially having a mass very close to solar and a young age. On this study, we monitored the magnetic field and the chromospheric activity from the Ca II H & K lines of k Cet. We used the Least-Square-Deconvolution (LSD, Donati et al. 1997) by simultaneously extracting the information contained in all 8,000 photospheric lines of the echelogram (K1 type star). To reconstruct a reliable magnetic map and characterize the surface differential rotation of k Cet we used 14 exposures spread over 2 months, in order to cover at least two rotational cycles (Prot ~ 9.2 days). The LSD technique was applied to detect the Zeeman signature of the magnetic field in each of our 14 observations and to measure its longitudinal component. In order to reconstruct the magnetic field geometry of k Cet, we applied the Zeeman Doppler Imaging (ZDI) inversion method. ZDI revealed a structure in the radial magnetic field consisting of a polar magnetic spot. On this study, we present the fisrt look results of a high-resolution spectropolarimetric campaign to characterize the activity and the magnetic fields of this young solar proxy.
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