The high-amplitude δ Scuti variable CY Aqr is probably a triple system  

作　　者：Wei-Jing Fang Zhi-Quan Luo Xiao-Bin Zhang Li-Cai Deng Kun Wang Yang-Ping Luo Yang Pan Yin-Jiang Peng 

机构地区：[1]Physics and Space Science College,China West Normal University [2]Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2016年第6期105-112,共8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 (Nos.U1331121,11373037 and U1231202)

摘　　要：Data representing 864 times of light maxima of the high-amplitude δ Scuti star CY Aqr were col- lected from the literature, based on which, long-term period changes of the variable star were investigated. A revised period and new ephemerides were given for the pulsating star. Remarkable cyclic variations were found in the O - C residuals which can be attributed to the light-time effects due to probable unseen com- ponents of the object. By using Kopal＇s method, the orbital parameters of the supposed component stars were derived. The solution suggests that CY Aqr is very probably in a triple system orbited eccentrically by two low-mass companions with periods of 54.2 and 47.3 yr. The lower limits on masses were estimated as 0.04 Me and 0.02 Me, respectively, for the two hidden companions.Data representing 864 times of light maxima of the high-amplitude δ Scuti star CY Aqr were col- lected from the literature, based on which, long-term period changes of the variable star were investigated. A revised period and new ephemerides were given for the pulsating star. Remarkable cyclic variations were found in the O - C residuals which can be attributed to the light-time effects due to probable unseen com- ponents of the object. By using Kopal＇s method, the orbital parameters of the supposed component stars were derived. The solution suggests that CY Aqr is very probably in a triple system orbited eccentrically by two low-mass companions with periods of 54.2 and 47.3 yr. The lower limits on masses were estimated as 0.04 Me and 0.02 Me, respectively, for the two hidden companions.

关 键 词：methods data analysis -- stars VARIABLES δ Scuti -- stars individual （CY Aqr） 

分 类 号：P145.2[天文地球—天体物理]