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《中国天文和天体物理学报(英文版)》 1987-01
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TU Her——An Algol System with Rapidly Decreasing Period

Li Qisheng Zhai Disheng Zhang Rongxian Zhang Jitong(Beijing Observatory, Academic Sirica)  
All available times of minima for TU Her(P = 2d·267, Sp:FO) are collected and analysed. The result shows that its period was decreasing rapidly in the interval of 1910 to 1977 with a rate of Δp/p- -1.29 ×10-8 - - 0.41 sec./yr.. There were three possibly abrupt changes in period during this'interval. We discussed the cause of the periodic variation and suggested that it may be connected with mass loss from the system.The following ephemeris was obtained with the observed data from JD.hel. 2439886-2443289 and can be used to predict the epoch of light minimum in recent years:
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