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arXiv 0912.0156astro-ph.SR
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由SDSS确定的激变变星的轨道周期。VII。四个新的食系

Orbital periods of cataclysmic variables identified by the SDSS. VII. Four new eclipsing systems

John Southworth, C. M. Copperwheat, B T Gansicke, S Pyrzas

摘要:

我们提出了九个激变变星由斯隆数字巡天,旨在测量这些系统的轨道周期测光。其中四个天体显示了深蚀,我们可以从中测量它们的轨道周期。还使用LCURVE代码分析了三个食系统的光变曲线,并确定了它们的质量比和轨道倾角。SDSS J075059.97+141150.1的轨道周期为134.1564 +/- 0.0008分,使其成为研究激变变星演化过程的有用天体。SDSS J092444.48+080150.9的周期为131.2432 +/- 0.0014 min,可能是磁性的。白矮星的进入和退出阶段非常深和短,没有明确的证据表明这个物体有吸积盘。SDSS J115207.00+404947.8和SDSS J152419.33+220920.1几乎是同卵双生子,周期分别为97.5 +/- 0.4和93.6 +/- 0.5 min,质量比分别为0.14 +/- 0.03和0.17 +/- 0.03。它们的日食有明确的白矮星和亮点的入口和出口特征,使它们成为详细研究的绝佳候选者。所有四个轨道周期都比在已知的激变变星群体中观察到的2-3小时周期间隔短。

英文摘要:

We present photometry of nine cataclysmic variable stars identified by the Sloan Digital Sky Survey, aimed at measuring the orbital periods of these systems. Four of these objects show deep eclipses, from which we measure their orbital periods. The light curves of three of the eclipsing systems are also analysed using the LCURVE code, and their mass ratios and orbital inclinations determined. SDSS J075059.97+141150.1 has an orbital period of 134.1564 +/- 0.0008 min, making it a useful object with which to investigate the evolutionary processes of cataclysmic variables. SDSS J092444.48+080150.9 has a period of 131.2432 +/- 0.0014 min and is probably magnetic. The white dwarf ingress and egress phases are very deep and short, and there is no clear evidence that this object has an accretion disc. SDSS J115207.00+404947.8 and SDSS J152419.33+220920.1 are nearly identical twins, with periods of 97.5 +/- 0.4 and 93.6 +/- 0.5 min and mass ratios of 0.14 +/- 0.03 and 0.17 +/- 0.03, respectively. Their eclipses have well-defined white dwarf and bright spot ingress and egress features, making them excellent candidates for detailed study. All four of the orbital periods presented here are shorter than the 2-3 hour period gap observed in the known population of cataclysmic variables.

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