Partial covering during long-term dips in Circinus X-1
文献类型：期刊论文
| 作者 | Ding, GQ; Qu JL(屈进禄) ; Li TB(李惕碚); Qu, JL; Li, TP
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| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2006 |
| 卷号 | 131期号:3页码:1693-1701 |
| 关键词 | X-rays : binaries X-rays : individual (Circinus X-1) X-rays : stars |
| 通讯作者 | Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China ; Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; Tsing Hua Univ, Dept Engn Phys, Beijing 100084, Peoples R China ; Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China |
| 英文摘要 | Using published observations with the Rossi X- Ray Timing Explorer satellite of the peculiar low- mass X- ray binary Circinus X- 1, we investigate its spectral evolution during a long- term dip just before periastron. The spectra can be fitted well by a two- blackbody model, the Eastern model or the modified Western model, plus partial covering absorption. The derived partial covering fraction and equivalent hydrogen column of partial covering absorption are correlated with the position on the hardness- intensity diagram. The heavy equivalent hydrogen column of partial covering ( N-H > 1024 cm (-2)) suggests that partial covering absorption is the crucial determinant for the long- term dip behavior observed in Cir X- 1. A low- energy component with luminosity between 3% and 4% of the nondip spectrum is not affected by the partial covering matter. A prominent iron emission line around 6.4 keV with variable flux is detected in the spectrum. The covering matter is distributed not only in the inner system but also in the disk and extends as far as the iron- line- emitting region in the disk. Several possible candidates for covering matter are discussed. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 原文出处 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000236143700038 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/239480]  |
| 专题 | 高能物理研究所_院士 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Ding, GQ,Qu JL,Li TB,et al. Partial covering during long-term dips in Circinus X-1[J]. ASTRONOMICAL JOURNAL,2006,131(3):1693-1701. |
| APA | Ding, GQ,屈进禄,李惕碚,Qu, JL,&Li, TP.(2006).Partial covering during long-term dips in Circinus X-1.ASTRONOMICAL JOURNAL,131(3),1693-1701. |
| MLA | Ding, GQ,et al."Partial covering during long-term dips in Circinus X-1".ASTRONOMICAL JOURNAL 131.3(2006):1693-1701. |
入库方式： OAI收割
来源：高能物理研究所
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