Partial covering during long-term dips in Circinus X-1

doi:10.1086/499921

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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
DOI	10.1086/499921
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
引用统计
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
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.

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