DI Hya: A Near-contact Binary with a Close-in Companion | |
Liao WP(廖文萍)1,2; Qian SB(钱声帮)1,2,3; Li LJ(李临甲)1,2; Zhou X(周肖)1,2; Zhao EG(赵二刚)1,2,3; Zhang J(张嘉)1,2 | |
刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC |
2017-03-01 | |
卷号 | 129期号:973 |
关键词 | Stars:) Binaries (Including Multiple): Close (Stars:) Binaries: Eclipsing Stars: Evolution Stars:Individual |
ISSN号 | 0004-6280 |
DOI | 10.1088/1538-3873/aa5869 |
产权排序 | 第1完成单位 |
文献子类 | Article |
英文摘要 | DI Hya is a short-period eclipsing binary and its classification has been discussed by several authors. New four-color light curves were obtained and have been analyzed together with the data from Manimanis & Niarchos simultaneously using the W-D method. The binary turns out to be a near-contact system where both components are filling or nearly filling their critical Roche lobes. The secondary has a temperature difference of Delta T similar or equal to-2800 K. The orbital period investigation has been ignored so far. All charge-coupled devices (CCD)and pe times of light minima are used for period analysis, showing that a cyclic variation with a short period of 1.46 years and a small semi-amplitude of 0.0034 days and a downward parabolic variation with a rate of P = -2.98(+/- 0.32)x 10(-7)days yr(-1). The short period and small semi-amplitude cyclic variations were analyzed for the light-travel time effect via the presence of a close-in tertiary binary with an orbital separation shorter than 1.57(+/- 0.31) au. Orbital properties of this close-in companion should provide valuable information on the formation of this short-period binary and stellar dynamical interaction. The downward parabolic change may be caused by angular momentum loss via an enhanced stellar wind of the more evolved secondary star. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星天文学 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | National Natural Science Foundation of China[11403095] ; National Natural Science Foundation of China[11325315] ; National Natural Science Foundation of China[U1631108] ; Yunnan Natural Science Foundation[2014FB187] ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of Chinese Academy of Sciences[XDB09010202] |
WOS关键词 | ORBITAL PERIOD CHANGES ; ANGULAR-MOMENTUM LOSS ; ALGOL-TYPE BINARIES ; VELOCITY CURVES ; POSSIBLE MASS ; LIGHT |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000423186500001 |
资助机构 | National Natural Science Foundation of China[11403095, 11325315, U1631108] ; Yunnan Natural Science Foundation[2014FB187] ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of Chinese Academy of Sciences[XDB09010202] |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/11905] |
专题 | 云南天文台_双星与变星研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
通讯作者 | Liao WP(廖文萍) |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, Republic of China 2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China 3.University of Chinese Academy of Sciences, Yuquan Road 19#, Shijingshan Block, 100049 Beijing, China |
推荐引用方式 GB/T 7714 | Liao WP,Qian SB,Li LJ,et al. DI Hya: A Near-contact Binary with a Close-in Companion[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2017,129(973). |
APA | Liao WP,Qian SB,Li LJ,Zhou X,Zhao EG,&Zhang J.(2017).DI Hya: A Near-contact Binary with a Close-in Companion.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,129(973). |
MLA | Liao WP,et al."DI Hya: A Near-contact Binary with a Close-in Companion".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 129.973(2017). |
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