基于光谱和测光数据的双星轨道参数的确定  

Determination of Orbital Parameters of Binary Stars Based on Spectrum and Photometric Data

作　　者：张思旋 刘超[1,2] 李佳东 ZHANG Si-xuan;LIU Chao;LI Jia-dong(National Astronomical Observatiories of China,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家天文台,北京100101 [2]中国科学院大学,北京100049

出　　处：《天文学进展》2022年第1期96-108,共13页Progress In Astronomy

基　　金：国家自然科学基金(11873057)。

摘　　要：利用LAMOST(Large sky Area Multi-Object fiber Spectroscopic Telescope)DR7和部分DR8的中分辨率数据与Chen等人[1]的WISE食双星的星表进行交叉,得到了151颗短周期的太阳型恒星,再选择其中观测次数在9次以上,并且相位分布比较均匀的23颗星,通过对它们视向速度进行分析,得到了这批样本的轨道周期、质量比、轨道偏心率等轨道参数。通过分析,发现所得到的周期与WISE给出的周期基本一致,所以WISE的周期是可靠的。之后用WISE的周期作为已知量,再去求解其他轨道参数,这样使其他的轨道参数更加准确。选取了其中速度曲线拟合较好的23颗食双星,对这批参数的统计性质进行分析,并与Ragavan等人[2]的结果进行对比,发现与Ragavan等人[2]的结果基本一致,在周期10 d以内的星,质量比分布在0.2~1范围内基本全覆盖,轨道偏心率都比较小,在0.2以下。Binary star systems or multi-star systems are a common result of stellar evolu-tion.Therefore,the dependence of the stellar multiplicity and other properties of the binary star system on the primary mass and the stellar formation environment play important role in stellar evolution.There are many ways to study binary stars,such as the light curves method,the velocity curves method,and the Hertzsprung-Russell diagram method.In re-cent years,with the emergence of many large-scale astronomical survey observations,we have obtained a large amount of photometric and spectral survey data.For these large-scale survey data,many statisical methods have been developed to study the properties of binary stars.We use the WISE eclipse binaries with the medium-resolution spectra of LAMOST DR7 and part of DR8,and obtained 151 short period solar-type stars,and then selected those with more than 9 observations and relatively uniform phase distribution.By ana-lyzing their radial velocities,the orbital parameters such as the orbital period,mass ratio,orbital eccentricity of this sample are obtained.We nd that the period we obtained consis-tent with that given by WISE.Thus,we use the period of WISE as a known quantity to solve for other orbital parameters,which makes other orbital parameters more accurate.Among them,23 stars were selected and the radial velocity curves are well tted by binary models.The statistical properties of these parameters are consistent with the results of Ragavan et al.For stars with orbital period of less than 10 days,their mass-ratio basically covers the entire parameter space from 0.2 to 1,while their orbital eccentricities are very small,all smaller than 0.2.

关 键 词：双星 LAMOST 视向速度 轨道参数 

分 类 号：P153[天文地球—天文学]