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
文献类型：期刊论文
| 作者 | Li LJ(李临甲)1,2,3 ; Qian SB(钱声帮)1,2,3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2014-10-11 |
| 卷号 | 444期号:1页码:600-605 |
| 关键词 | space vehicles: Kepler techniques: photometric stars: individual: FN Lyr stars: individual: V894 Cyg stars: variables: RR Lyrae |
| ISSN号 | 0035-8711 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Li, LJ (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/444/1/600 |
| 语种 | 英语 |
| WOS记录号 | WOS:000342925100046 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5894]  |
| 专题 | 云南天文台_双星与变星研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 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 |
| 推荐引用方式 GB/T 7714 | Li LJ,Qian SB. 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.(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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来源：云南天文台
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