Orbital period analysis of eclipsing dwarf novae: U Geminorum
文献类型：期刊论文
| 作者 | Dai ZB(戴智斌) ; Qian SB(钱声帮)
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| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
 |
| 出版日期 | 2009-05 |
| 卷号 | 321期号:2页码:91-100 |
| ISSN号 | 0004-640X |
| 关键词 | Stars: cataclysmic variables Stars: binaries: eclipsing Stars: individual U Geminorum |
| 通讯作者 | Dai, ZB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | A new orbital period analysis for U Geminorum is made by means of the standard O-C technique based on 187 times of light minima including the three newest CCD data from our observation. Although there are large scatter near 70,000 cycles in its O-C diagram, there is strong evidence (>99.9% confidence level) to show the secular increase of orbital period with a rate (P) over dot = 7.8(1) x 10(-12) s(-1). Using the physical parameters recently derived by Echevarr a et al. (Astron. J. 134: 262, 2007), the range of mass transfer rate for U Geminorum is estimated as from-3.5(5) x 10(-9) M(circle dot) yr(-1) to-1.30(6) x 10(-8) M(circle dot) yr(-1). Moreover, the data before 60,000 cycles shows the obvious quasi-period variations. The least square estimation of a similar to 17.4 yr quasi-periodic variation superimposed on secular orbital period increase is derived. Considering the possibility that solar-type magnetic activity cycles in the secondary star of U Geminorum may produce the quasi-period variations of the orbital period, Applegate's mechanism is discussed and the results indicate such mechanism has difficulty explaining the quasi-period variation for U Geminorum. Hence, we attempted to apply the light-travel time effect to interpret the quasi-period variation and found the perturbation of similar to 17.4 yr quasi-period may result from a brown dwarf. If the orbital inclination is assumed as i similar to 15 degrees, corresponding to the upper limit of mass of a brown dwarf, then its orbital radii is similar to 7.7 AU. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | CATACLYSMIC VARIABLES ; ADDITIONAL TIMES ; T AURIGAE ; EX HYDRAE ; BINARIES ; COMPONENTS ; OUTBURST ; MINIMA ; GEM |
| 收录类别 | SCI |
| 原文出处 | http://link.springer.com/article/10.1007%2Fs10509-009-9982-0 |
| 语种 | 英语 |
| WOS记录号 | WOS:000265440200002 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5824]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 推荐引用方式 GB/T 7714 | Dai ZB,Qian SB. Orbital period analysis of eclipsing dwarf novae: U Geminorum[J]. ASTROPHYSICS AND SPACE SCIENCE,2009,321(2):91-100. |
| APA | 戴智斌,&钱声帮.(2009).Orbital period analysis of eclipsing dwarf novae: U Geminorum.ASTROPHYSICS AND SPACE SCIENCE,321(2),91-100. |
| MLA | 戴智斌,et al."Orbital period analysis of eclipsing dwarf novae: U Geminorum".ASTROPHYSICS AND SPACE SCIENCE 321.2(2009):91-100. |
入库方式： OAI收割
来源：云南天文台
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