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