论文标题
四连销系统HIP 45734
The quadruple system HIP 45734
论文作者
论文摘要
髋关节45734是一个由2+2个体系结构组成的四倍系统，位于太阳的68 pc。外部9英寸系统A，B的周期为〜10^4年。AA，AB是一种视觉二进制，周期为20。1年，偏心率为0.78。在2019.1上观察到其periastron，从光谱上观察到质量，产生质量（1.10+-0.04和0.98+-0.98+-03 m_sun）和ORBALAX和ORBALAX和ORBALAX和ORBALAX+37.9999999990.99999990.9999990.999.9990.99.99.990.99.99.99.99.99.99.99.99.99.-lathax。质量，亮度和颜色与主序列的进化模型AA具有可检测的锂线，而在AB中，BB是一个单线光谱二进制的，具有0.5552天的时期BB是〜0.4 m_sun。
HIP 45734 is a quadruple system of 2+2 architecture located at 68 pc from the Sun. The outer 9" system A,B has a period of ~10^4 yr. The pair Aa,Ab is a visual binary with a period of 20.1 years and an eccentricity of 0.78. Its periastron in 2019.1 was observed spectroscopically, yielding masses (1.10+-0.04 and 0.98+-0.03 M_sun) and orbital parallax, 14.90+-0.37 mas. The masses, luminosities, and colors approximately agree with evolutionary models of main sequence stars. The component Aa has a detectable lithium line, whereas in Ab it is absent. The pair Ba,Bb is a single-lined spectroscopic binary with a period of 0.55552 day and an orbital inclination of ~45 deg derived by modeling the rotationally broadened line profile with ``flat bottom''. The mass of Bb is ~0.4 M_sun. The star B is chromospherically active (an x-ray source); its flux is modulated with the orbital period by starspots, in addition to occasional flares. The system is probably older than ~600 Myr; it does not belong to any known moving group.
