低质量相互作用双星系统OO Aql的再研究：一个新的四重系统
The low-mass interacting binary system OO Aql revisited: a new quadruple system
摘要：
在这项研究中，我们提出了光度和光谱变化分析和轨道周期的低质量相互作用系统OO Aql的研究。同时解出了主星和伴星的光速和视向速度曲线，从而确定了主星和伴星的一组新的恒星物理参数：M $_{1}$ = 1.05（2）M $_{\odot}$，M $_{2}$ = 0.89（2）M $_{\odot}$，R $_{1}$ = 1.38（2）R $_{\odot}$，R $_{2}$ = 1.28（2）R $_{\odot}$，测定了$\log{(L_1/L_{\odot})} = 0.258$和$\log{(L_2/L_{\odot})} = 0.117$以及组分的分离a = 3.333（16）R $_{\odot}$。新获得的参数产生的系统的距离为136（8）pc。对日食中期时间的分析表明，周期增加了$\frac{P}{\dot{P}}=4\times 10^{7}$年，这可以用质量转移$\frac{dM}{dt}=5\times 10^{-8}$ M $_{\odot}$ /年来解释，从质量较小的组件到质量较大的组件。我们的新解决方案证实了OO Aql是一个AB + C + D形式的多系统。用非保守恒星演化模型（EV-TWIN）计算了该系统的初始天体物理参数，得到其年龄为8.6 Gyr。
英文摘要：
In this study we present photometric and spectroscopic variation analysis and orbital period study of a low-mass interacting system OO Aql. Simultaneous solution of the light and radial velocity curves provide us a determination of new set of stellar physical parameters for the primary and the secondary companion as M$_{1}$ = 1.05(2) M$_{\odot}$, M$_{2}$ = 0.89(2) M$_{\odot}$, R$_{1}$ = 1.38(2) R$_{\odot}$, R$_{2}$ = 1.28(2) R$_{\odot}$, $\log{(L_1/L_{\odot})} = 0.258$ and $\log{(L_2/L_{\odot})} = 0.117$ and the separation of the components were determined a = 3.333(16) R$_{\odot}$. Newly obtained parameters yield the distance of the system as 136(8) pc. Analyses of the mid-eclipse times indicate a period increase of $\frac{P}{\dot{P}}=4\times 10^{7}$ yr that can be interpreted in terms of the mass transfer $\frac{dM}{dt}=5\times 10^{-8}$ M$_{\odot}$/yr from the less massive component to the more massive component. Our new solution confirmed that OO Aql is a multiple system in the form of AB + C + D. We found initial astrophysical parameters for the component of the system and its current age to be 8.6 Gyr using nonconservative stellar evolution model (EV-TWIN code).
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