揭示分层三合星系统 CN Lyn 的起源与动力学
Unveiling the Origins and Dynamics of the Hierarchical Triple Star System CN Lyn
AI总结：
本研究结合光谱、TESS测光与运动学数据，精确测定三合星 CN Lyn 的参数、稳定性及轨道，揭示其银盘边缘起源，并提出第三星源自银晕捕获。
摘要：
在本研究中，我们结合文献中的光谱数据、TESS测光数据以及运动学技术，对一个被忽视的三合星系统 CN Lyn 进行了详细分析。我们高精度地更新了该系统中已知食双星组件的基本参数。系统中两个食双星组件（Aab）和第三个组件（B）的化学成分均得到了非常精确的计算。根据我们的分析，食双星组件的质量、半径和金属丰度分别为：Aa 为 $1.166_{-0.012}^{+0.013}\\,M_\odot$、$1.786_{-0.014}^{+0.013}\\,R_\odot$ 和 $-0.78_{-0.02}^{+0.02}$ dex；Ab 为 $1.143_{-0.012}^{+0.013}\\,M_\odot$、$1.651_{-0.013}^{+0.014}\\,R_\odot$ 和 $-0.55_{-0.02}^{+0.03}$ dex。该双星对的年龄为 $3.89_{-0.10}^{+0.10}$ Gyr。B 的质量、半径、金属丰度和年龄分别为 $0.85_{-0.23}^{+0.23}\\,M_\odot$、$1.436_{-0.023}^{+0.026}\\,R_\odot$、$-1.83_{-0.11}^{+0.09}$ dex 和 $12.5_{-2.5}^{+2.5}$ Gyr。研究还发现，该三合星系统（AabB）满足分层三合星系统的稳定性判据。CN Lyn 的运动学和银河系轨道参数由该系统的天体测量和光谱数据获得。考虑中心双星系统（A）中各组成恒星年龄的动力学轨道分析表明，CN Lyn 起源于银盘的贫金属边缘。就年龄、α元素和金属丰度而言，该系统的第三个组件被发现属于晕族成员。鉴于 B 与 A 相比具有不同的化学丰度和年龄，这表明第三个组件是在远离银盘、引力相互作用较弱的区域被中心系统捕获的。
英文摘要：
In this study we present a detailed analysis of CN Lyn, an overlooked triple star system, by combining spectroscopic data from the literature, photometric \textit{TESS} data, and kinematic techniques. We updated the fundamental parameters of the known eclipsing components in the system with high precision. The chemical composition of both eclipsing components (Aab) and the third component (B) in the system were calculated with great accuracy. According to our analysis the mass, radius, and metallicity of the eclipsing components are $1.166_{-0.012}^{+0.013}\,M_\odot$, $1.786_{-0.014}^{+0.013}\,R_\odot$, and $-0.78_{-0.02}^{+0.02}$ dex for Aa and $1.143_{-0.012}^{+0.013}\,M_\odot$, $1.651_{-0.013}^{+0.014}\,R_\odot$, and $-0.55_{-0.02}^{+0.03}$ dex for Ab. The pair's age is $3.89_{-0.10}^{+0.10}$ Gyr. The mass, radius, metallicity, and age for B are $0.85_{-0.23}^{+0.23}\,M_\odot$, $1.436_{-0.023}^{+0.026}\,R_\odot$, $-1.83_{-0.11}^{+0.09}$ dex, and $12.5_{-2.5}^{+2.5}$ Gyr, respectively. It is also found that the triple system (AabB) satisfies the stability criteria for the hierarchical triple system. Kinematic and Galactic orbital parameters of CN Lyn were obtained from the astrometric and spectroscopic data of the system. Dynamical orbital analyses, taking into account the ages of the component stars in the central binary system (A) show that the CN Lyn originated at the metal-poor edge of the Galactic disk. The third component of the system was found to be a member of the halo population in terms of age, $α$ elements and metal abundance. Given the different chemical abundances and age of B compared to A, this suggests that the third component was captured by the central system in a region with weak gravitational interactions far beyond the Galactic disc.
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