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KIC 12268220: A δ Scuti Pulsating Star and an Active Protohelium White Dwarf in an Eclipsing Binary System
Cui,Kaiming1,2; Guo,Zhao3,4; Gao,Qing1; Ren,Juanjuan1; Zhang,Junbo1; Zhou,Yutao5,6; Liu,Jifeng1,2,7
2020-07-31
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume898Issue:2
AbstractAbstract We present a photometric, spectroscopic, asteroseismic, and evolutionary analysis of the Algol-type eclipsing binary KIC 12268220. We find the O’Connell effect and anticorrelated eclipse timing variations in the Kepler light curve, revealing the presence of large starspots. Radial velocities and atmospheric parameters are obtained from ground-based spectroscopic observations. Combined with the radial velocity measurements and Gaia-derived total luminosity, our light-curve modeling yields the solution of the physical parameters for both the primary and secondary components. We find 14 independent frequencies arising from the δ Scuti primary, and the observed frequencies agree with the frequency range of unstable modes from nonadiabatic calculations. Based on the conclusion from previous literature, we run a grid of models to study the evolution process of our system. The evolutionary tracks of our model suggest that the low-mass ( ) evolved secondary shows a similar evolutionary state to the R CMa-type system, which might evolve to an EL CVn system.
KeywordEclipsing binary stars Delta Scuti variable stars White dwarf stars Stellar evolution
DOI10.3847/1538-4357/ab9b85
Language英语
WOS IDIOP:0004-637X-898-2-ab9b85
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/63255
Collection中国科学院国家天文台
Affiliation1.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China; cuikaiming15@mails.ucas.ac.cn
2.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3.Center for Exoplanets and Habitable Worlds, Department of Astronomy and Astrophysics, 525 Davey Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
4.Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
5.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China
6.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China
7.WHU-NAOC Joint Center for Astronomy, Wuhan University, Wuhan, Hubei 430072, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Cui,Kaiming,Guo,Zhao,Gao,Qing,et al. KIC 12268220: A δ Scuti Pulsating Star and an Active Protohelium White Dwarf in an Eclipsing Binary System[J]. The Astrophysical Journal,2020,898(2).
APA Cui,Kaiming.,Guo,Zhao.,Gao,Qing.,Ren,Juanjuan.,Zhang,Junbo.,...&Liu,Jifeng.(2020).KIC 12268220: A δ Scuti Pulsating Star and an Active Protohelium White Dwarf in an Eclipsing Binary System.The Astrophysical Journal,898(2).
MLA Cui,Kaiming,et al."KIC 12268220: A δ Scuti Pulsating Star and an Active Protohelium White Dwarf in an Eclipsing Binary System".The Astrophysical Journal 898.2(2020).
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