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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Physical properties and evolutionary status of the W-subtype contact binary V502 Oph with a stellar companion
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Physical properties and evolutionary status of the W-subtype contact binary V502 Oph with a stellar companion

机译：具有恒星伴星的W型接触二元V502 Oph的物理性质和进化状态

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摘要

Multi-color (B, V, R-c, I-c) CCD photometric light curves of the contact binary V502 Oph are analyzed using the Wilson-Devinney program. The solutions reveal that V502 Oph is a W-subtype contact (f = 35.3%) binary system. The temperature difference between its two components is 240 K and the more massive star has a lower surface temperature. A cool spot is added in our model to account for the light curves' asymmetry (O'Connell effect) and a third light is detected for the first time in the light curves' modeling. Combining the orbital inclination (i = 76 degrees.4) with the published mass function of V502 Oph, the absolute physical parameters of the two components are determined, which are M-1 = 0.46(+/- 0.02) M-circle dot, M-2 = 1.37(+/- 0.02) M-circle dot, R-1 = 0.94(+/-0.01) R-1, R-2 = 1.51(+/-0.01) R-circle dot, L-1 = 1.13(+/-0.02) L-circle dot, and L-2 = 2.49(+/-0.03) L-circle dot. The formation and the evolutionary status of V502 Oph are discussed. All photoelectric and CCD times of light minimum about V502 Oph are gathered and its orbital period variations are analyzed. The results show that the orbital period of V502 Oph is decreasing continuously at a rate of dP/dt = -1.69 x 10(-7) dyr(-1), which corresponds to a conservative mass transfer rate of dM(2)/ dt = -3.01 x 10(-8) M-circle dot yr(-1). The light-travel time effect is due to the presence of a close-in tertiary component with a period of P-3 = 18.7 yr and an amplitute of 0.00402 d. V502 Oph is an ideal target to test the formation and evolution theories of binary andmultiple systems in which the light curves, the O - C curve and spectroscopic observations are comprehensively researched.
机译：使用Wilson-Devinney程序分析了接触二进制V502 Oph的多色（B，V，R-c，I-c）CCD光度光曲线。解决方案表明，V502 Oph是W型接触（f = 35.3％）二元系统。它的两个分量之间的温差为240 K，质量较大的恒星的表面温度较低。在我们的模型中添加了一个凉点，以解决光曲线的不对称性（O'Connell效应），并且在光曲线的建模中首次检测到第三种光。结合轨道倾角（i = 76度4）和已发布的V502 Oph质量函数，确定了两个分量的绝对物理参数，即M-1 = 0.46（+/- 0.02）M圆点， M-2 = 1.37（+/- 0.02）M圆点，R-1 = 0.94（+/- 0.01）R-1，R-2 = 1.51（+/- 0.01）R圆点，L-1 = 1.13（+/- 0.02）L圆点，而L-2 = 2.49（+/- 0.03）L圆点。讨论了V502 Oph的形成和进化状态。收集所有最小约为V502 Oph的光电和CCD时间，并分析其轨道周期变化。结果表明，V502 Oph的轨道周期以dP / dt = -1.69 x 10（-7）dyr（-1）的速率连续减小，这对应于dM（2）/ dt的保守传质速率= -3.01 x 10（-8）M圆点yr（-1）。光旅行时间的影响是由于存在一个近距离的三次分量，周期​​为P-3 = 18.7年，安培数为0.00402 d。 V502 Oph是测试二元和多元系统的形成和演化理论的理想目标，该系统对光曲线，OC曲线和光谱观测进行了全面研究。

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