VW LMi：已知最紧密的四重系统。光时效应与可能的轨道长期变化
VW LMi: tightest quadruple system known. Light-time effect and possible secular changes of orbits
摘要：
目前已知的四双星系统VW LMi由P_12 = 0.477551天的接触食双星和P_34 = 7.93063天的分离双星组成，它们在355.0天的较紧轨道上旋转。本文介绍了新的光度和光谱观测结果，得到了69次最小值和36个解纠缠径向速度。所有可用的径向速度和最小时间相结合，以更好地表征轨道，并得出组件的绝对参数。四重星系的总质量估计为4.56 M_sun。轨道周期P = 7.93天的分离不食双星，其拱点运动与U约为80年。由接触双星的引力摄动引起的岁差周期估计为120年左右。观测结果表明，这对极轨与非食对极轨的宽互轨接近于共面，避免了非食对极轨倾角的任何变化，也排除了未来第二次食系的发生。讨论了天体测量解的可能性和直接解算宽互轨的可能性。附近的恒星HD 95606是一颗松散的双星，有四重星系VW LMi。
英文摘要：
Tightest known quadruple systems VW LMi consists of contact eclipsing binary with P_12 = 0.477551 days and detached binary with P_34 = 7.93063 days revolving in rather tight, 355.0-days orbit. This paper presents new photometric and spectroscopic observations yielding 69 times of minima and 36 disentangled radial velocities for the component stars. All available radial velocities and minima times are combined to better characterize the orbits and to derive absolute parameters of components. The total mass of the quadruple system was estimated at 4.56 M_sun. The detached, non-eclipsing binary with orbital period P = 7.93 days is found to show apsidal motion with U approximately 80 years. Precession period in this binary, caused by the gravitational perturbation of the contact binary, is estimated to be about 120 years. The wide mutual orbit and orbit of the non-eclipsing pair are found to be close to coplanarity, preventing any changes of the inclination angle of the non-eclipsing orbit and excluding occurrence of the second system of eclipses in future. Possibilities of astrometric solution and direct resolving of the wide, mutual orbit are discussed. Nearby star, HD95606, was found to form loose binary with quadruple system VW LMi.
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