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Follow-up Ground-based Observations of the Dwarf Nova KZ Gem
Dai ZB(戴智斌)1,2,3,4,5; Szkody, Paula6; Thorstensen, John R.7; Medagangoda, N. Indika8
Source PublicationASTROPHYSICAL JOURNAL
2020-04-01
Volume893Issue:1Pages:17
DOI10.3847/1538-4357/ab7e28
Contribution Rank第1完成单位
Indexed BySCI
KeywordClose binary stars Interacting binary stars Semi-detached binary stars Cataclysmic variable stars Novae Dwarf novae
Abstract

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.

Funding ProjectCAS 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
Funding OrganizationCAS 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
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000528723700001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCATACLYSMIC VARIABLES ; STELLAR PHOTOMETRY ; CATALOG ; PERIOD ; ATLAS ; STARS ; TRANSFORMATIONS ; REDSHIFTS ; BINARIES ; COLORS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/23141
Collection双星与变星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorDai ZB(戴智斌)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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.
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