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Follow-up Ground-based Observations of the Dwarf Nova KZ Gem

文献类型：期刊论文

作者Dai, Zhibin2,3,4,5,6; Szkody, Paula1; Thorstensen, John R.8; Medagangoda, N. Indika7
刊名ASTROPHYSICAL JOURNAL
出版日期2020-04-01
卷号893期号:1页码:17
关键词Close binary stars Interacting binary stars Semi-detached binary stars Cataclysmic variable stars Novae Dwarf novae
ISSN号0004-637X
DOI10.3847/1538-4357/ab7e28
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.
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
WOS记录号WOS:000528723700001
出版者IOP PUBLISHING LTD
资助机构CAS Light of West China Program ; CAS Light of West China Program ; Chinese Natural Science Foundation ; Chinese Natural Science Foundation ; Science Foundation of Yunnan Province ; Science Foundation of Yunnan Province ; NSF ; NSF ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; CAS Light of West China Program ; CAS Light of West China Program ; Chinese Natural Science Foundation ; Chinese Natural Science Foundation ; Science Foundation of Yunnan Province ; Science Foundation of Yunnan Province ; NSF ; NSF ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; CAS Light of West China Program ; CAS Light of West China Program ; Chinese Natural Science Foundation ; Chinese Natural Science Foundation ; Science Foundation of Yunnan Province ; Science Foundation of Yunnan Province ; NSF ; NSF ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; CAS Light of West China Program ; CAS Light of West China Program ; Chinese Natural Science Foundation ; Chinese Natural Science Foundation ; Science Foundation of Yunnan Province ; Science Foundation of Yunnan Province ; NSF ; NSF ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences
源URL[http://ir.bao.ac.cn/handle/114a11/55059]  
专题中国科学院国家天文台
通讯作者Dai, Zhibin
作者单位1.Univ Washington, Dept Astron, Seattle, WA 98195 USA
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
5.Chinese Acad Sci, Ctr Astron Megasci, 20A Datun Rd, Beijing 100012, Peoples R China
6.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
7.Arthur C Clarke Inst Modern Technol, Astron Div, Moratuwa, Sri Lanka
8.Dartmouth Coll, Dept Phys & Astron, 6127 Wilder Lab, Hanover, NH 03755 USA
推荐引用方式
GB/T 7714		 Dai, Zhibin,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, Zhibin,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, Zhibin,et al."Follow-up Ground-based Observations of the Dwarf Nova KZ Gem".ASTROPHYSICAL JOURNAL 893.1(2020):17.

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