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KIC 8262223: A Post-mass Transfer Eclipsing Binary Consisting of a Delta Scuti Pulsator and a Helium White Dwarf Precursor
Guo, Zhao1; Gies, Douglas R.1; Matson, Rachel A.1; Hernandez, Antonio Garcia2; Han ZW(韩占文)3; Chen XF(陈雪飞)3; Guo, Zhao(Georgia State Univ, Dept Phys & Astron, POB 5060, Atlanta, GA 30302 USA)
发表期刊ASTROPHYSICAL JOURNAL
2017-03-10
卷号837期号:2
DOI10.3847/1538-4357/aa61a4
产权排序第3完成单位
收录类别SCI
关键词Binaries: Eclipsing Stars: Evolution Stars: Oscillations (Including Pulsations) Stars: Variables: Delta Scuti White Dwarfs
摘要KIC 8262223 is an eclipsing binary with a short orbital period (P = 1.61 day). The Kepler light curves are of Algol-type and display deep and partial eclipses, ellipsoidal variations, and pulsations of delta Scuti type. We analyzed the Kepler photometric data, complemented by phase-resolved spectra from the R-C Spectrograph on the 4 meter Mayall telescope. at the. Kitt Peak National Observatory and determined the fundamental parameters of this system. The low-mass and oversized secondary (M-2 = 0.20M(circle dot), R-2 = 1.31R(circle dot)) is the remnant of the donor star that transferred most of its mass to the gainer, and now the primary star. The current primary star is thus not a normal delta Scuti star but the result of mass accretion from a lower mass progenitor. We discuss the possible evolutionary history and demonstrate with the MESA evolution code that this system and several other systems discussed in prior literature can be understood as the result of non-conservative binary evolution for the formation of EL CVn-type binaries. The pulsations of the primary star can be explained as radial and non-radial pressure modes. The equilibrium models from single star evolutionary tracks can match the observed mass and radius (M-1 = 1.94M(circle dot), R-1 = 1.67R(circle dot)) but the predicted unstable modes associated with these models differ somewhat from those observed. We discuss the need for better theoretical understanding of such post-mass transfer delta Scuti pulsators.
项目资助者NASA's Science Mission Directorate ; NASA(NNX12AC81G, NNX13AC21G, NNX13AC20G) ; National Science Foundation(AST-1411654) ; Fundacao para a Ciencia e a Tecnologia (FCT, Portugal)(SFRH/BPD/80619/2011) ; EC(FP7-SPACE-2012-312844) ; Natural Science Foundation of China(11521303, 11390374, 11422324) ; GSU College of Arts and Sciences ; Research Program Enhancement fund of the Board of Regents of the University System of Georgia
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000397497300001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]STELLAR ASTROPHYSICS MESA ; INSTABILITY STRIP ; CLOSE BINARIES ; COMPONENT SPECTRA ; UNEXPECTED SERIES ; LIGHT CURVES ; SHORT-PERIOD ; DATA RELEASE ; STARS ; CATALOG
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9990
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Guo, Zhao(Georgia State Univ, Dept Phys & Astron, POB 5060, Atlanta, GA 30302 USA)
作者单位1.Center for High Angular Resolution Astronomy and Department of Physics and Astronomy,Georgia State University, P.O. Box 5060, Atlanta, GA 30302-5060, USA
2.Instituto de Astrofísica e Ciências do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, the Chinese Academy of Sciences, Kunming, 650011, China
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Guo, Zhao,Gies, Douglas R.,Matson, Rachel A.,et al. KIC 8262223: A Post-mass Transfer Eclipsing Binary Consisting of a Delta Scuti Pulsator and a Helium White Dwarf Precursor[J]. ASTROPHYSICAL JOURNAL,2017,837(2).
APA Guo, Zhao.,Gies, Douglas R..,Matson, Rachel A..,Hernandez, Antonio Garcia.,Han ZW.,...&Guo, Zhao.(2017).KIC 8262223: A Post-mass Transfer Eclipsing Binary Consisting of a Delta Scuti Pulsator and a Helium White Dwarf Precursor.ASTROPHYSICAL JOURNAL,837(2).
MLA Guo, Zhao,et al."KIC 8262223: A Post-mass Transfer Eclipsing Binary Consisting of a Delta Scuti Pulsator and a Helium White Dwarf Precursor".ASTROPHYSICAL JOURNAL 837.2(2017).
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