Period changes of the long-period cataclysmic binary EX Draconis
Period changes of the long-period cataclysmic binary EX Draconis
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DOI：
10.1051/0004-6361/201117972
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发表时间：
2012-03
影响因子：
6.5
通讯作者：
L. Pilarčík;M. Wolf;P. Dubovský;K. Hornoch;L. Kotková
中科院分区：
文献类型：
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作者：
L. Pilarčík;M. Wolf;P. Dubovský;K. Hornoch;L. Kotková
激变变星EX Dra是一颗相对较暗但经常被研究的遮蔽矮星的新星。作为我们对有趣的日食系统进行长期监测的一部分，我们总共测量了35次新的日食。利用2004至2011年间已公布的和新的中食时间，我们构建了观测减去计算图。目前的数据显示了21年的周期调制，半幅度为2.5min。日食时间与最好的正弦曲线拟合有显著的偏离，这表明该星历不是对数据的完整描述。分数周期变化大致为ΔP/P=3×10−6。
The cataclysmic variable star EX Dra is a relatively faint but frequently investigated eclipsing dwarf nova. In total 35 new eclipses were measured photometrically as part of our long-term monitoring of interesting eclipsing systems. Using published and new mid-eclipse times obtained between 2004 and 2011 we constructed the observed-minus-calculated diagram. The current data present 21 years of period modulation with a semi-amplitude of 2.5 min. The eclipse timings show significant deviations from the best sinusoidal fit, which indicates that this ephemeris is not a complete description of the data. The fractional period change is roughly ΔP/P = 3 × 10 −6 .