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arXiv 1706.08930astro-ph.SR
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中间极性V2069 Cyg(RX J2123 .7+4217)的广泛光度测定

Extensive photometry of the intermediate polar V2069 Cyg (RX J2123.7+4217)

V. P. Kozhevnikov

摘要:

为了高精度地获得中极天鹅座V2069中白矮星的自转周期,我们进行了广泛的测光。观测在32个夜晚内进行,总共持续119小时,历时15个月。我们发现了白矮星的自转周期,等于743.40650+/-0.00048秒。利用我们精确的自转周期,我们得到了36年的长期有效的振荡星历。该星历表和精确的自转周期可用于进一步研究天鹅座V2069中白矮星的自转周期变化。此外,我们首次探测到周期为764.5125+/-0.0049 s的边带振荡。自旋和边带振荡揭示了不稳定的振幅都在一个时间尺度的天,并在一个时间尺度的年。平均而言,自旋振荡的半振幅从2014年的17 mmag变化到2015年的25 mmag。边带振荡的半振幅从2014年的12 mmag变化到2015年的不到7 mmag的不可检测水平。在几年的时间尺度上,光学自旋脉冲轮廓显示出从2014年的不对称双峰形状到2015年的准正弦形状的根本变化。这种剧烈的变化的光学自旋脉冲轮廓似乎不典型的大多数中间极性,因此,是极大的兴趣。边带振荡的脉冲轮廓是准正弦的。此外,我们注意到,V2069 Cyg具有峰-峰幅度为0.4-0.6兆的强闪烁。

英文摘要:

To obtain the spin period of the white dwarf in the intermediate polar V2069 Cyg with high precision, we fulfilled extensive photometry. Observations were performed within 32 nights, which have a total duration of 119 hours and cover 15 months. We found the spin period of the white dwarf, which is equal to 743.40650+/-0.00048 s. Using our precise spin period, we derived the oscillation ephemeris with a long validity of 36 years. This ephemeris and the precise spin period can be used for future investigations of spin period changes of the white dwarf in V2069 Cyg. In addition, for the first time we detected the sideband oscillation with a period of 764.5125+/-0.0049 s. The spin and sideband oscillations revealed unstable amplitudes both in a time-scale of days and in a time-scale of years. On average, the semi-amplitude of the spin oscillation varied from 17 mmag in 2014 to 25 mmag in 2015. The semi-amplitude of the sideband oscillation varied from 12 mmag in 2014 to an undetectable level of less than 7 mmag in 2015. In a time-scale of years, the optical spin pulse profile revealed essential changes from an asymmetric double-peaked shape in 2014 to a quasi-sinusoidal shape in 2015. Such drastic changes of the optical spin pulse profile seem untypical of most intermediate polars and, therefore, are of great interest. The pulse profile of the sideband oscillation was quasi-sinusoidal. Moreover, we note that V2069 Cyg possesses strong flickering with a peak-to-peak amplitude of 0.4-0.6 mag.

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