We present two semi-detached binaries with extremely low mass-ratio (<0.1). The total eclipse feature on the light curves greatly improves the reliability of the binary light analysis results. Combining the photometric and spectral data, both the relative and the absolute parameters were obtained based on two methods. The masses and radii are M 1 = 1.21 ± 0.45 M ⊙ , M 2 = 0.116 ± 0.044 M ⊙ , R 1 = 1.89 ± 0.25 R ⊙ , and R 2 = 0.76 ± 0.1 R ⊙ for KIC 2719436, and M 1 = 1.58 ± 0.49 M ⊙ , M 2 = 0.153 ± 0.051 M ⊙ , R 1 = 1.9 ± 0.28 R ⊙ , and R 2 = 5.14 ± 0.79 R ⊙ for KIC 4245897. The binaries with extremely low mass-ratios provide a laboratory to study the binary outcomes as well as the extremely low-mass stars w...

中文翻译：

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质量比率极低的半分离式二进制文件：KIC 2719436和KIC 4245897

我们介绍了两个半分离二进制文件，它们的质量比极低（<0.1）。光曲线上的全食特征大大提高了二值光分析结果的可靠性。结合光度和光谱数据，基于两种方法获得了相对参数和绝对参数。对于KIC 2719436，质量和半径为M 1 = 1.21±0.45 M⊙，M 2 = 0.116±0.044 M⊙，R 1 = 1.89±0.25 R⊙，R 2 = 0.76±0.1 R⊙，M 1 = 1.58对于KIC 4245897，±0.49 M⊙，M 2 = 0.153±0.051 M⊙，R 1 = 1.9±0.28 R⊙和R 2 = 5.14±0.79 R.。具有极低质量比的二元色谱仪提供了实验室研究双星结局以及极低质量的恒星...