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arXiv 1612.06643astro-ph.SR
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寻找恒星日冕物质抛射

Hunting for Stellar Coronal Mass Ejections

Heidi Korhonen, Krisztian Vida, Martin Leitzinger, Petra Odert, Orsolya Eszter Kovacs

摘要:

日冕物质抛射(CME)是太阳上每天都会发生的爆炸性事件。人们认为这些事件在晚型恒星的角动量和质量损失中起着至关重要的作用,也塑造了行星形成和生活的环境。恒星的日冕物质抛射可以在巴耳末线的光谱中被探测到,特别是在H α中,作为蓝移的额外发射/吸收。为了增加检测概率,人们可以监测年轻的疏散星团,其中的恒星由于年轻而仍然快速旋转,因此磁活跃,可能会出现大量的日冕物质抛射。利用欧洲南方天文台(ESO)的观测设备和北欧光学望远镜,我们获得了6个疏散星团中晚型恒星的多天体分光观测时间序列,它们的年龄从1500万年到30000万年。此外,我们还研究了许多活跃恒星的档案数据。这些观测将使我们能够获得不同年龄和光谱类型的晚型恒星中CME发生率的信息。在这里,我们报告我们的研究的初步结果。

英文摘要:

Coronal mass ejections (CMEs) are explosive events that occur basically daily on the Sun. It is thought that these events play a crucial role in the angular momentum and mass loss of late-type stars, and also shape the environment in which planets form and live. Stellar CMEs can be detected in optical spectra in the Balmer lines, especially in Halpha, as blue-shifted extra emission/absorption. To increase the detection probability one can monitor young open clusters, in which the stars are due to their youth still rapid rotators, and thus magnetically active and likely to exhibit a large number of CMEs. Using ESO facilities and the Nordic Optical Telescope we have obtained time series of multi-object spectroscopic observations of late-type stars in six open clusters with ages ranging from 15 Myrs to 300 Myrs. Additionally, we have studied archival data of numerous active stars. These observations will allow us to obtain information on the occurrence rate of CMEs in late-type stars with different ages and spectral types. Here we report on the preliminary outcome of our studies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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