KIC 5197256:an eclipsing binary containing a δ Scuti variable star  

作　　者：Cheng-Long Lv Ali Esamdin Jun-Hui Liu Xiang-Yun Zeng Tao-Zhi Yang 吕成龙;艾力·伊沙木丁;刘军辉;曾祥云;杨涛只(Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Astronomy,Xiamen University,Xiamen 361005,China;School of Physics,Xi'an Jiaotong University,Xi’an 710049,China)

机构地区：[1]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Astronomy,Xiamen University,Xiamen 361005,China [4]School of Physics,Xi'an Jiaotong University,Xi’an 710049,China

出　　处：《Research in Astronomy and Astrophysics》2021年第9期111-123,共13页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.U2031209)。

摘　　要：This paper reports analysis of an eclipsing binary system KIC 5197256 with aδSct variable component.Utilizing light-curve modeling,several stellar parameters are derived,e.g.,temperature,mass,and mass ratio.The O-C diagram is a straight line with a negative slope which means that its period is almost constant for about 2 yr.Frequency analyses are performed for the residual light curve after subtracting the binary variations.The frequency spectrum reveals that one component star is aδScuti variable.Large frequency separation is cross-identified with the histogram graph and the Fourier transform method.Based on the large separation and density relationship,the mean density of theδSct component is estimated to be 0.05 g·cm-3.Five frequencies with the same frequency spacing in the range of 25 d-1-34 d-1 are detected.Statistically,the pulsation amplitudes ofδSct stars increase with decreasing of rotations,so we propose that KIC 5197256 might have a relatively large rotational velocity,and the frequency f10 might be the rotation frequency.

关 键 词：binaries:eclipsing-stars:individual:KIC 5197256 stars:variables:δScuti stars:oscillations 

分 类 号：P145.2[天文地球—天体物理]