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Detection of a degenerate companion of the SX phoenicis star KZ Hydrae by studying its long-term variability
Fu, JN1; Khokhuntod, P2; Rodriguez, E3; Boonyarak, C2; Marak, K2; Lopez-Gonzalez, MJ3; Zhu LY(朱俐颖)4; Qian SB(钱声帮)4; Jiang, SY5; Fu, JN (reprint author), Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2008-05
卷号135期号:5页码:1958-1967
DOI10.1088/0004-6256/135/5/1958
产权排序第4完成单位
收录类别SCI
关键词Stars : Individual (Kz Hya) Stars : Variables : Other Techniques : Photometric
摘要We present 109 new times of maximum light of the SX Phoenicis (SX Phe) star KZ Hydrae (KZ Hya) based mainly on our extensive photometric observations for two decades, leading to determination of a general ephemeris combined with the data in the literature. The O - C diagram reveals a continuously increasing period change combined with the light traveling time effect of the orbital motion of KZ Hya in a binary system with an orbital period of 26.8 +/- 0.2 years. The deduced mass of the companion cannot be smaller than 0.83 M circle dot. Since no sign of the companion has ever been observed spectroscopically and the observed color index b-y excludes the possibility of the companion being a late-type main-sequence or dwarf star, KZ Hya becomes the first SX Phe star for which a degenerate companion is detected. The pulsation properties are studied by analyzing the Fourier spectra of the observed light curves while the fundamental parameters are deduced with the simultaneous multicolor uvby beta data, showing this star to be a strong low-metallicity high-amplitude SX Phe-type variable pulsating in the fundamental radial mode. No signs of multiperiodicity or significant long-term changes in amplitude are detected in the pulsation of this variable.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
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WOS记录号WOS:000255407700026
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]AMPLITUDE DELTA-SCUTI ; PULSATING STARS ; PHOTOMETRY ; HD-94033 ; TELESCOPE ; CATALOG ; COLORS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5812
专题双星与变星研究组
通讯作者Fu, JN (reprint author), Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China.
作者单位1.Department of Astronomy, Beijing Normal University, Beijing 100875, China
2.Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
3.Instituto de Astrofísica de Andalucia, CSIC, PO Box 3004, 18080 Granada, Spain
4.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011, China
5.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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Fu, JN,Khokhuntod, P,Rodriguez, E,et al. Detection of a degenerate companion of the SX phoenicis star KZ Hydrae by studying its long-term variability[J]. ASTRONOMICAL JOURNAL,2008,135(5):1958-1967.
APA Fu, JN.,Khokhuntod, P.,Rodriguez, E.,Boonyarak, C.,Marak, K.,...&Fu, JN .(2008).Detection of a degenerate companion of the SX phoenicis star KZ Hydrae by studying its long-term variability.ASTRONOMICAL JOURNAL,135(5),1958-1967.
MLA Fu, JN,et al."Detection of a degenerate companion of the SX phoenicis star KZ Hydrae by studying its long-term variability".ASTRONOMICAL JOURNAL 135.5(2008):1958-1967.
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