The semi-detached binary system IU Per and its intrinsic oscillation

作     者：Xiao-Bin Zhang Rong-Xian Zhang Qi-Sheng Li 

作者机构：National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 

出 版 物：《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报（英文版）)

年 卷 期：2009年第9卷第4期

页      面：422-430页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 081704[工学-应用化学] 0709[理学-地质学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：Supported by the National Natural Science Foundation of China 

主　　题：stars binaries eclipsing-stars oscillations-stars individual (IU Per) 

摘      要：We present a long-term time-resolved photometry of the short-period eclipsing binary IU Per. It confirms the intrinsic 6 Scuti-like pulsation of the system reported by Kim et al.. With the obtained data, an orbital period study and an eclipsing light curve synthesis based on the Wilson-Devinney method were carded out. The photometric solution reveals a semi-detached configuration with the less-massive component filling its own Roche-lobe. By subtracting the eclipsing light changes from the data, we obtained the pure pulsating light curve of the mass-accreting primary component. A Fourier analysis reveals four pulsation modes with confidence larger than 99%. A mode identification based on the results of the photometric solution was made. It suggests that the star may be in radial pulsation with a fundamental period of about 0.0628 d. A brief discussion concerning the evolutionary status and the pulsation nature is finally given.