The New RS CVn Binary V1034 Her Revisited and the orbital period - Activity relation of Short-period RS CVn binaries using photometric distortion amplitude
The New RS CVn Binary V1034 Her Revisited and the orbital period - Activity relation of Short-period RS CVn binaries using photometric distortion amplitude
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DOI：
10.1088/1674-4527/12/4/007
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
Zhang Liyun
中科院分区：
文献类型：
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作者：
Zhang Liyun
本文给出了2009年和2010年新发现的RS CVn对双星V1034 Her的新的CCD BVRI光曲线，其形状与之前发表的结果不同。它们在日食外表现出不对称，我们试图用一个点模型来解释这一现象。采用单点或双点模型的Wilson-Devinney程序，推导了系统的光度解和星斑参数。两种结果的比较表明，两个光斑的情况更能成功地再现光曲线畸变。对于所有的点经度，表明向活动经度带和各活动经度带的趋势可能是切换的。对比2009年和2010年的光曲线，可以发现光曲线在1年的长时间尺度上发生变化，特别是在0.25相位。此外，我们还收集了短周期RS CVn二进制的最大光度失真幅度值。我们首次发现，随着轨道周期的减小，其活度有增加的趋势。最后，用多项式函数拟合包括我们新得到的光最小时间在内的所有可用光最小时间，证实了V1034的轨道周期呈上升趋势。
This paper presents new CCD BVRI light curves of the newly discovered RS CVn eclipsing binary V1034 Her in 2009 and 2010, which shapes are different from the previous published results. They show asymmetric outside eclipse and we try to use a spot model to explain the phenomena. Using the Wilson-Devinney program with one-spot or two-spots model, photometric solutions of the system and starspot parameters were derived. Comparing the two results, it shows that the case of two spots is better successful in reproducing the light-curve distortions. For all the spot longitudes, it suggests that the trend towards active longitude belts and each active longitude belts might be switch. Comparing the light curves of 2009 and 2010, it indicates that the light curve changes on a long time scale of one year, especially in phase 0.25. In addition, we also collected the values of the maximum amplitudes of photometric distortion of the short-period RS CVn binary. We found for the first time that there is a trend of increasing activity with decreasing the orbital period. Finally, fitting all available light minimum times including our newly obtained ones with polynomial function confirmed that the orbital period of V1034 underwent up increase.