Follow-up Ground-based Observations of the Dwarf Nova KZ Gem
文献类型:期刊论文
作者 | Dai ZB(戴智斌)1,2,3,4,5; Szkody, Paula6; Thorstensen, John R.7; Medagangoda, N. Indika8 |
刊名 | ASTROPHYSICAL JOURNAL |
出版日期 | 2020-04-01 |
卷号 | 893期号:1页码:17 |
ISSN号 | 0004-637X |
关键词 | Close binary stars Interacting binary stars Semi-detached binary stars Cataclysmic variable stars Novae Dwarf novae |
DOI | 10.3847/1538-4357/ab7e28 |
产权排序 | 第1完成单位 |
文献子类 | Article |
英文摘要 | We present spectroscopy of stars in the immediate vicinity of the dwarf nova (DN) KZ Gem to confirm its identification, which is ambiguous in the literature. Analysis of 73 radial velocities spanning from 2014 to 2019 provides a high-precision orbital period of 0.2224628(2) days (similar to 5.34 hr) and shows KZ Gem to be a double-lined DN. Time series photometry taken from 2016 to 2018 shows a variable double-hump modulation with a full amplitude of similar to 0.3 mag, along with five Gaussian-like transient events lasting similar to 30 minutes or more. Using the light-curve code XRBinary and nonlinear fitting code NMfit, we obtain an optimized binary model of the dwarf nova (DN) KZ Gem, from time series photometry, consisting of a Roche-lobe-filling K-type dwarf with a mass transfer rate of (2.7-7.9) x 10(-10) M yr(-1) to a large, cool, and thick disk surrounding a white dwarf, in an orbit with an inclination of 516(14). Two hotspots on the disk are demonstrated to cause the observed variations in the ellipsoidal modulations from the secondary star. This physical model is compatible with the Gaia distance of KZ Gem. |
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 |
WOS关键词 | CATACLYSMIC VARIABLES ; STELLAR PHOTOMETRY ; CATALOG ; PERIOD ; ATLAS ; STARS ; TRANSFORMATIONS ; REDSHIFTS ; BINARIES ; COLORS |
资助项目 | CAS Light of West China Program ; Chinese Natural Science Foundation[11933008] ; Science Foundation of Yunnan Province[2016FB007] ; NSF[AST-1514737] ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000528723700001 |
资助机构 | CAS Light of West China Program ; Chinese Natural Science Foundation[11933008] ; Science Foundation of Yunnan Province[2016FB007] ; NSF[AST-1514737] ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences |
源URL | [http://ir.ynao.ac.cn/handle/114a53/23140] |
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 | Dai ZB(戴智斌) |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China 3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China 4.University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049, People's Republic of China 5.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China 6.Department of Astronomy, University of Washington, Seattle, WA 98195, USA 7.Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory Hanover, NH 03755, USA 8.Astronomy Division, Arthur C. Clarke Institute for Modern Technologies, Sri Lanka |
推荐引用方式 GB/T 7714 | Dai ZB,Szkody, Paula,Thorstensen, John R.,et al. Follow-up Ground-based Observations of the Dwarf Nova KZ Gem[J]. ASTROPHYSICAL JOURNAL,2020,893(1):17. |
APA | Dai ZB,Szkody, Paula,Thorstensen, John R.,&Medagangoda, N. Indika.(2020).Follow-up Ground-based Observations of the Dwarf Nova KZ Gem.ASTROPHYSICAL JOURNAL,893(1),17. |
MLA | Dai ZB,et al."Follow-up Ground-based Observations of the Dwarf Nova KZ Gem".ASTROPHYSICAL JOURNAL 893.1(2020):17. |
入库方式: OAI收割
来源:云南天文台
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