论文标题
选定太阳能双胞胎的活动
Activity of Selected Solar Twins
论文作者
论文摘要
我们分析了23个太阳能双胞胎的各种磁性活性示踪剂，其特征是锂大气中的大量散射。从可用的X射线和UV-Archival数据中研究了冠状动脉和色球活性水平。它使我们有机会将各个年龄的太阳能双胞胎与太阳能案例进行比较。我们通过几个数量级在X射线与辐射光度比率$ l_x/l_ {bol} $中发现了一个散射，这些数量级存在于这些恒星中，并在li丰富的情况下存在显着的扩散。这可能会将恒星的表面活性与对流区域的基础的现象联系起来。苔丝数据使我们能够揭示与星形相关的恒星亮度的旋转调制。对于我们的一些样品的一些双胞胎，检测到轴向旋转时期大约6天，即这些恒星的旋转速度比当代太阳快几乎快4倍。这表明他们的年轻人。苔丝数据中发现了太阳能双胞胎的耀斑活性。我们展示了各种耀斑的存在，并为其中一些耀斑提供了时间概况。我们获得了大约$ 8 \ times 10^{33} $ erg的能量，用于我们的样品中最大的耀斑，持续时间超过4小时。此外，我们还讨论了磁场和系外行星，绕这些恒星绕。
We analyze various tracers of magnetic activity for 23 solar twins which are characterized by significant scatter of lithium abundance in their atmospheres. A level of coronal and chromospheric activity has been studied from available X-ray and UV-archival data. It gives us a chance to compare coronae of solar twins of various ages with the solar case. We found a scatter in the X-ray to bolometric luminosity ratio $L_X/L_{bol}$ by several orders of magnitude, which exists in these stars along with a significant spread in Li abundance. This may link the surface activity of stars with phenomena at the base of their convective zones. The TESS data allowed us to reveal rotation modulation of stellar brightness associated with starspots. For some twins of our samples, periods of axial rotation are detected around 6 days, i.e. these stars rotate almost 4 times faster than the contemporary Sun. This indicates their relative youth. Flare activity of solar twins is discovered in the TESS data; we showed existence of various kinds of flares, and present temporal profiles for some of them. We obtained the energy about of $8 \times 10^{33}$ erg for the largest flare of our samples, lasting longer than 4 h. In addition, we discuss also magnetic fields and exoplanets, orbiting these stars.
