几种可分辨多重系统的相对轨道定向
Relative orbit orientation in several resolved multiple systems
摘要：
这项工作扩展了已知相对轨道方向的多颗恒星的数量。精确的天体测量和径向速度被联合用于计算或更新三个邻近的三重系统HIP 101955中的外轨道和内轨道（轨道周期38.68年和2.51年），HIP 103987 HIP 111805（30.13年和1.50年）和HIP 2643（70.3年，4.85年和0.276年），都由太阳型恒星组成。质量由绝对星等估算，并使用轨道进行检查。外内周期比（14 ~ 20）和外轨道偏心率适中。这些系统是动态稳定的，但离稳定极限不远。在这三个系统中，所有的轨道都近似共面，并且有很小的偏心率，而在HIP 101955中，e=0.6的内轨道是高度倾斜的。
英文摘要：
This work extends the still modest number of multiple stars with known relative orbit orientation. Accurate astrometry and radial velocities are used jointly to compute or update outer and inner orbits in three nearby triple systems HIP 101955 (orbital periods 38.68 and 2.51 years), HIP 103987 (19.20 and 1.035 years), HIP 111805 (30.13 and 1.50 years) and in one quadruple system HIP 2643 (periods 70.3, 4.85 and 0.276 years), all composed of solar-type stars. The masses are estimated from the absolute magnitudes and checked using the orbits. The ratios of outer to inner periods (from 14 to 20) and the eccentricities of the outer orbits are moderate. These systems are dynamically stable, but not very far from the stability limit. In three systems all orbits are approximately coplanar and have small eccentricity, while in HIP 101955 the inner orbit with e=0.6 is highly inclined.
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