摘要
食双星是国际上比较前沿的研究课题之一。为了分析研究分离食双星AK Dra和CW Peg的历元公式和周期变化,本文收集整理了食双星AK Dra和CW Peg发表的所有的极小时刻。通过对极小时刻的拟合,更新这两颗食双星的线性历元公式。通过该历元公式计算获得线性拟合的残差。发现AK Dra和CW Peg周期存在抛物线的变化:AK Dra存在开口向上抛物线变化,而CW Peg存在开口向下的抛物线变化。利用最小二乘法分析首次获得AK Dra轨道周期增加率为1.61±(0.02)×10^(-6)d/a,并更新CW Peg轨道周期减少率为1.56±(0.01)×10^(-6)d/a。最后给出食双星AK Dra和CW Peg周期变化的物理机制。
Eclipsing binary is one of the frontier research programs in the world. To calculate an updated ephemeris and the orbital period variations of two detached eclipsing binaries AK Dra and CW Peg,all the published moments of minima of eclipsing binaries AK Dra and CW Peg were compiled. By linear fitting of the minima,the linear epoch formula of the two eclipsing binaries were updated. The residual of the linear fit was obtained through the linear epoch formula. Results show that there is a parabola variation of O-C data of the two eclipsing binaries.There is an upward parabola period change for AK Dra and a downward parabola period change for CW Peg.First,by using least square method,the parabola period changes are analyzed to obtain the periodic increase rate of AK Dra（ 1.61±（ 0.02） × 10^-6 d/a） and the periodic decrease rate of CW Peg（ 1.56±（ 0.01） × 10^-6 d/a） Finally,the physical mechanism of periodic variation for AK Dra and CW Peg are concluded.
作者
田乐
张立云
岳强
皮青峰
TIAN Le;ZHANG Liyun;YUE Qiang;PI Qingeng(Department of Physics and Astronomy,Guizhou Univerity,Guiyang 550025,China;Department of Astronomy,Beijing Normal Univerity,Beijing 100001,China)
出处
《贵州大学学报（自然科学版）》
2018年第4期62-68,共7页
Journal of Guizhou University:Natural Sciences
基金
国家自然科学基金天文联合基金项目资助(U1431114
U1631236)
关键词
分离食双星
周期变化
LAMOST光谱
物理机制
detached eclipsing binar
perodic varation
LAMOST spectra
physical mechanisms
