Abstract

We present the first high accuracy UBVRI(RI)c CCD light curves of the newly discovered eclipsing system PS UMa = GSC 4375 1733 (\(P = 9_{·}^{d}27\), \(V = 12_{·}^{m}42\)). The photometric solutions are found, the physical parameters of the components are derived. The eccentricity of the orbit was found to be negligible e = 0.074, which made it difficult to measure the rate of the apsidal rotation. High accuracy of our observations allowed us to find the reliable parameters of the system. Components (Sp = F7 + G1) have advanced significantly in their evolution, the age of the system is 2.4 billion years. The mass and the radius of G1 component is larger and it is ahead of the F7 component in its evolution. The model of the system best suits the theory in the absence of the overshooting in the core. Obtained from our observations photometrical parallax π = 0\(_{.}^{\prime\prime }\)00102(2) coincides with GAIA DR2 value \(\pi =0_{·}^{\prime\prime }00106(3)\) within their errors. The new EW type variable with period \( \approx {\kern 1pt} 0_{·}^{d}40\) was found in the field of PS UMa.

中文翻译：

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爬升系统PS UMa：组件的进化状态和物理参数

摘要

我们展示了新发现的日蚀系统PS UMa = GSC 4375 1733（\（P = 9_ {·} ^ {d} 27 \），\（V = 12_ {· ）的第一条高精度UBVRI（RI）c CCD光曲线。} ^ {m} 42 \））。找到了光度学解决方案，得出了组件的物理参数。轨道的偏心率被认为是微不足道的è ＝ 0.074，这使得很难测量两点旋转的速率。观测值的高度准确性使我们能够找到系统的可靠参数。组件（Sp = F7 + G1）的演变已显着进步，系统的寿命为24亿年。G1分量的质量和半径较大，并且在其演变过程中领先于F7分量。在核心中不存在超调的情况下，系统模型最适合该理论。从我们的观察中获得光度视差π= 0 \（_ {。} ^ {\ prime \ prime} \） 00102（2）与GAIA DR2值\（\ pi = 0_ {·} ^ {\ prime \ prime} 00106一致（3）\）内的错误。周期为\（\ approx {\ kern 1pt} 0_ {·} ^ {d} 40 \）的新EW类型变量 在PS UMa领域被发现。