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Orbits and Structure of the Quadruple Systems GJ 225.1 and FIN 332
Astronomy Letters ( IF 0.9 ) Pub Date : 2021-01-22 , DOI: 10.1134/s1063773720090078
A. Tokovinin

Abstract

Only a handful of quadruple systems with two accurate inner visual orbits are known. The architecture of two such systems is studied here to determine the period ratios, mutual orbit orientation, and other parameters; updated orbital elements and their errors are derived. Gliese 225.1 (HIP 28442) is composed of three K-type and one M-type dwarfs and has inner orbital periods of 67.2 \(\pm\) 0.2 and 23.4 \(\pm\) 0.5 yr. Its inner orbits have a small mutual inclination and are likely coplanar with the outer orbit of \({\sim}2\) kyr period. The quadruple system FIN 332 (HIP 92037) consists of four early A type stars with similar masses and magnitudes. Both its inner orbits with periods of 27.6 \(\pm\) 0.2 and 39.8 \(\pm\) 0.4 yr have large eccentricities (0.82 and 0.84). Their orientation in the sky is remarkably similar. In contrast, the outer orbit with a period of \({\sim}5\) kyr has a large relative inclination to the inner orbits. The dynamics and formation of these quadruple systems are briefly discussed.



中文翻译:

四重系统GJ 225.1和FIN 332的轨道和结构

摘要

只有少数具有两个准确的内部视觉轨道的四重系统是已知的。本文研究了两个这样的系统的体系结构,以确定周期比,相互轨道方向和其他参数。得到更新的轨道元素及其误差。Gliese 225.1(HIP 28442)由三个K型矮星和一个M型矮星组成,内部轨道周期为6年\(\ pm \) 0.2和23.4 \(\ pm \) 0.5年。它的内部轨道相互倾角较小,并且可能与\({\ sim} 2 \)吉尔周期的外部轨道共面。四重系统FIN 332(HIP 92037)由四颗质量和大小相似的早期A型恒星组成。它的两个内部轨道的周期分别为27.6 \(\ pm \) 0.2和39.8 \(\ pm \)0.4年的偏心率较大(0.82和0.84)。它们在天空中的方向非常相似。相反,周期为\({\ sim} 5 \)吉尔的外轨道相对于内轨道具有较大的相对倾角。简要讨论了这些四重系统的动力学和结构。

更新日期:2021-01-22
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