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arXiv 1701.07892astro-ph.SR
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SDSS J105754 .25+275947.5:一个周期反弹食灾变变量,具有迄今测量的最低质量供体

SDSS J105754.25+275947.5: a period-bounce eclipsing cataclysmic variable with the lowest-mass donor yet measured

M. J. McAllister, S. P. Littlefair, V. S. Dhillon, T. R. Marsh, B. T. Gänsicke, J. Bochinksi, M. C. P. Bours, E. Breedt, L. K. Hardy, J. J. Hermes, S. Kengkrian… 展开作者

M. J. McAllister, S. P. Littlefair, V. S. Dhillon, T. R. Marsh, B. T. Gänsicke, J. Bochinksi, M. C. P. Bours, E. Breedt, L. K. Hardy, J. J. Hermes, S. Kengkriangkrai, P. Kerry, S. G. Parsons, S. Rattanasoon

摘要:

我们提出了高速,多色测光的微弱,日食激变变量(CV)SDSS J105754.25+275947.5。这个系统发出的光主要由白矮星发出。尽管如此,平均许多日食揭示了亮点日食的其他特征。这使得参数化的日食模型能够拟合这些平均光变曲线,从而精确测量系统参数。我们发现质量比q = 0.0546 $\pm$ 0.0020和倾角i = 85.74 $\pm$ 0.21 $^{\circ}$。白矮星和施主质量分别为M $_{\mathrm{w}}$ = 0.800 $\pm$ 0.015 M $_{\odot}$和M $_{\mathrm{d}}$ = 0.0436 $\pm$ 0.0020 M $_{\odot}$。通过将模式大气预测值与多色通量拟合,估算出该白矮星的温度T $_{\mathrm{w}}$ = 13300 $\pm$ 1100 K,距离d = 367 $\pm$ 26 pc。SDSS 105754.25+275947.5中的白矮星的质量接近CV白矮星的平均值,而供体的质量是在食CV中测量到的最低质量。一个低质量的施主和轨道周期(90.44分钟)明显长于周期最小值,这强烈表明这是一个真正的周期反弹系统,尽管不能排除白矮星/棕矮星双星的形成。目前已知的具有精确系统参数的周期最小值/周期反弹系统非常少,因此,在这种情况下CV的演变尚未完全理解。

英文摘要:

We present high-speed, multicolour photometry of the faint, eclipsing cataclysmic variable (CV) SDSS J105754.25+275947.5. The light from this system is dominated by the white dwarf. Nonetheless, averaging many eclipses reveals additional features from the eclipse of the bright spot. This enables the fitting of a parameterised eclipse model to these average light curves, allowing the precise measurement of system parameters. We find a mass ratio of q = 0.0546 $\pm$ 0.0020 and inclination i = 85.74 $\pm$ 0.21$^{\circ}$. The white dwarf and donor masses were found to be M$_{\mathrm{w}}$ = 0.800 $\pm$ 0.015 M$_{\odot}$ and M$_{\mathrm{d}}$ = 0.0436 $\pm$ 0.0020 M$_{\odot}$, respectively. A temperature T$_{\mathrm{w}}$ = 13300 $\pm$ 1100 K and distance d = 367 $\pm$ 26 pc of the white dwarf were estimated through fitting model atmosphere predictions to multicolour fluxes. The mass of the white dwarf in SDSS 105754.25+275947.5 is close to the average for CV white dwarfs, while the donor has the lowest mass yet measured in an eclipsing CV. A low-mass donor and an orbital period (90.44 min) significantly longer than the period minimum strongly suggest that this is a bona fide period-bounce system, although formation from a white dwarf/brown dwarf binary cannot be ruled out. Very few period-minimum/period-bounce systems with precise system parameters are currently known, and as a consequence the evolution of CVs in this regime is not yet fully understood.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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