arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.1747astro-ph.SR
收藏

活动恒星II的多个和不断变化的周期。结果

Multiple and changing cycles of active stars II. Results

K. Oláh, Z. Kolláth, T. Granzer, K. G. Strassmeier, A. F. Lanza, S. Järvinen, H. Korhonen, S. L. Baliunas, W. Soon, S. Messina, G. Cutispoto

摘要:

我们根据几十年的光度或光谱观测,研究了20颗活跃恒星周期的时间变化。的时间-频率分析的方法,在配套文件中讨论的,适用于数据。其中15颗恒星明确显示了多个周期;其余恒星的记录太短,无法验证第二个周期的时间尺度。周期通常显示系统性变化。对于三颗恒星,我们发现每颗恒星都有两个周期不是谐波,而是平行变化的,这表明发电机结构产生了一个共同的物理机制。对于不均匀的活动恒星集合,证实了自转周期和周期之间的正相关关系。恒星的活动周期通常是多个和可变的。

英文摘要:

We study the time variations of the cycles of 20 active stars based on decades-long photometric or spectroscopic observations. A method of time-frequency analysis, as discussed in a companion paper, is applied to the data. Fifteen stars definitely show multiple cycles; the records of the rest are too short to verify a timescale for a second cycle. The cycles typically show systematic changes. For three stars, we found two cycles in each of them that are not harmonics, and which vary in parallel, indicating that a common physical mechanism arising from a dynamo construct. The positive relation between the rotational and cycle periods is confirmed for the inhomogeneous set of active stars. Stellar activity cycles are generally multiple and variable.

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。

↑