论文标题
Ad Leo*上耀斑和CME的高分辨率光谱
High-resolution spectroscopy of flares and CMES on AD Leo*
论文作者
论文摘要
耀斑和冠状质量弹出（CME）对于行星大气的演变及其潜在的宜居性很重要，尤其是对于在距离<0.4 au的旋转M恒星的行星中。 CME在这些恒星上的检测很少，因此以前的研究通过扩大太阳关系来建模其发生频率。但是，由于M星上磁场的拓扑和强度与太阳的拓扑和强度不同，因此这种方法效果很好。我们使用了大量的高分辨率光谱来研究耀斑，CME及其活跃的M矮星和狮子座的动力学。然后可以将结果用作其他M矮人的参考。我们获得了高度活跃的M矮人Ad Leo的2000多个高分辨率光谱（R〜35000），该光谱几乎可以看到。使用这些数据，我们研究了光谱线HALPHA，HBETA和HE 5876的行为，并研究了可能是CME的多普勒特征的不对称特征。我们发现了许多耀斑。最大的耀斑在HBETA中排放的8.32 x 10 31 ERG和HALPHA中的2.12 x 10 32 ERG。尽管该事件和其他事件中的光谱线显示出明显的蓝色不对称性，但与之相关的速度远低于逃逸速度。尽管AD LEO显示出高水平的耀斑活性，但CME的数量相对较低。因此，使用与太阳相同的M矮人使用相同的Flare-CME关系是不合适的。
Flares and coronal mass ejections (CMEs) are important for the evolution of the atmospheres of planets and their potential habitability, particularly for planets orbiting M stars at a distance < 0.4 AU. Detections of CMEs on these stars have been sparse, and previous studies have therefore modelled their occurrence frequency by scaling up solar relations. However, because the topology and strength of the magnetic fields on M stars is different from that of the Sun, it is not obvious that this approach works well. We used a large number of high-resolution spectra to study flares, CMEs, and their dynamics of the active M dwarf star AD Leo. The results can then be used as reference for other M dwarfs. We obtained more than 2000 high-resolution spectra (R~35000) of the highly active M dwarf AD Leo, which is viewed nearly pole on. Using these data, we studied the behaviour of the spectral lines Halpha , Hbeta , and He I 5876 in detail and investigated asymmetric features that might be Doppler signatures of CMEs. We detected numerous flares. The largest flare emitted 8.32 x 10 31 erg in Hbeta and 2.12 x 10 32 erg in Halpha . Although the spectral lines in this and other events showed a significant blue asymmetry, the velocities associated with it are far below the escape velocity. Although AD Leo shows a high level of flare activity, the number of CMEs is relatively low. It is thus not appropriate to use the same flare-to-CME relation for M dwarfs as for the Sun.
