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Partial covering during long-term dips in Circinus X-1
Ding, GQ; Qu JL(屈进禄); Li TB(李惕碚); Qu, JL; Li, TP
2006
发表期刊ASTRONOMICAL JOURNAL
卷号131期号:3页码:1693-1701
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
文章类型Article
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.
关键词X-rays : binaries X-rays : individual (Circinus X-1) X-rays : stars
学科领域Astronomy & Astrophysics
DOI10.1086/499921
URL查看原文
语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000236143700038
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239480
专题院士
粒子天体物理中心
作者单位中国科学院高能物理研究所
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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.
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