Four-colour photometry of EY Dra: A study of an ultra-fast rotating active dM1-2e star
Four-colour photometry of EY Dra: A study of an ultra-fast rotating active dM1-2e star
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EY Dra 的四色光度测量：超快旋转活跃 dM1-2e 恒星的研究
DOI：
10.1002/asna.200911341
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发表时间：
2010
影响因子：
0.9
通讯作者：
K. Posztob'anyi
中科院分区：
文献类型：
--
作者：
K. Vida;K. Ol'ah;Zs. KHov'ari;J. Jurcsik;'A. s'odor;M. V'aradi;B. Belucz;I. D'ek'any;Zs. Hurta;I. Nagy;K. Posztob'anyi
我们介绍了在BV(RI)C通带中对EY血竭的1000多天的光度测量。光线曲线的变化是由旋转表面的斑点引起的。对斑点表面的模拟表明，在恒星的两个相对的半球上存在两个大的活动区。表面图案的演变表明了一种触发器现象。利用傅立叶分析，我们发现了一个PROT=0.45875 d的自转周期和一个P≈为350d的活动周期，类似于太阳长达11年的周期。这个周期长达一年的周期是在活动恒星上检测到的最短的周期。还探测和分析了两个明亮的耀斑(2010Wiley-VCH Verlag GmbH&Co.KGaA，Weinheim)
We present more than 1000-day long photometry of EY Draconis in BV (RI)C passbands. The changes in the light curve are caused by the spottedness of the rotating surface. Modelling of the spotted surface shows that there are two large active regions present on the star on the opposite hemispheres. The evolution of the surface patterns suggests a flip-flop phenomenon. Using Fourier analysis, we detect a rotation period of Prot = 0.45875 d, and an activity cycle with P ≈ 350 d, similar to the 11-year long cycle of the Sun. This cycle with its year-long period is the shortest one ever detected on active stars. Two bright flares are also detected and analysed (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)