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Period analysis of two non-Blazhko RRab stars, FN Lyr and V894 Cyg, based on Kepler photometry: evidence of low-mass companions on wider orbits
Li LJ(李临甲)1,2,3; Qian SB(钱声帮)1,2,3; Li, LJ (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2014-10-11
卷号444期号:1页码:600-605
DOI10.1093/mnras/stu1344
产权排序第1完成单位
收录类别SCI
关键词Space Vehicles: Kepler Techniques: Photometric Stars: Individual: Fn Lyr Stars: Individual: V894 Cyg Stars: Variables: Rr Lyrae
摘要Long-cadence-corrected pre-search data conditioning (PDC) fluxes of FN Lyr (KIC 6936115) and V894 Cyg (KIC 9591503), observed continuously by the Kepler mission, spanning over 1470 d, are used to determine hundreds of times of maximum and minimum for the analysis of O - C residuals. The interpretation of the clear variations in the O - C diagrams is that these are caused by the light-travel-time effect as a result of additional companions. The mass functions of the companions are f (M) = (3.94 +/- 0.82) x 10(-6) and (2.01 +/- 0.22) x 10(-4) M-circle dot. Assuming that the orbital plane inclination follows a random distribution, the companions to both stars can be constrained to be substellar objects (brown dwarf or giant planet), with 89.4 and 59.4 per cent probability, respectively. Under the assumption that the orbital inclination equals 90 degrees, the distances between the companions and the central RR Lyrae stars at periastron should be 1.03 and 0.50 au, respectively. In addition, the orbital periods are 794.8 and 1084.4 d for FN Lyr and V894 Cyg, respectively. By comparing these orbital parameters with those of B subdwarf stars in binary systems, there are strong hints that horizontal branch stars might have different evolution histories. The long-term pulsation period changes are also discussed. Based on our studies, RR Lyrae stars in binary systems are not rare, at least among binary systems with wider separations.
项目资助者National Aeronautics and Space Administration (NASA) Science Mission Directorate ; NASA [NAS5-26555] ; NASA Office of Space Science [NNX13AC07G] ; Chinese Natural Science Foundation [11133007, 11325315]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2014-11-21
WOS记录号WOS:000342925100046
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GRAVITATIONAL LENSING EXPERIMENT. ; SUBDWARF-B-STARS ; OGLE-III CATALOG ; ECLIPSING BINARY ; EXTRASOLAR PLANETS ; TAROT TELESCOPES ; SEARCH ; SYSTEM ; GEOS ; CANDIDATES
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5894
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Li, LJ (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China
3.University of Chinese Academy of Sciences, 100049 Beijing, China/Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
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Li LJ,Qian SB,Li, LJ . Period analysis of two non-Blazhko RRab stars, FN Lyr and V894 Cyg, based on Kepler photometry: evidence of low-mass companions on wider orbits[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,444(1):600-605.
APA Li LJ,Qian SB,&Li, LJ .(2014).Period analysis of two non-Blazhko RRab stars, FN Lyr and V894 Cyg, based on Kepler photometry: evidence of low-mass companions on wider orbits.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,444(1),600-605.
MLA Li LJ,et al."Period analysis of two non-Blazhko RRab stars, FN Lyr and V894 Cyg, based on Kepler photometry: evidence of low-mass companions on wider orbits".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444.1(2014):600-605.
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