Spectral state transitions in Aquila X-1: Evidence for "propeller" effects
Zhang, SN; Yu, W; Zhang, W
刊名ASTROPHYSICAL JOURNAL
1998
卷号494期号:1页码:L71-L74
关键词accretion, accretion disks binaries, general stars, individual (Aquila X-1, Centaurus X-4) stars, low-mass, brown dwarfs stars, neutron
学科分类Astronomy & Astrophysics
DOI10.1086/311161
通讯作者NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA ; Inst High Energy Phys, LCRHEA, Beijing 100039, Peoples R China ; NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
文章类型Article
英文摘要Aquila X-l is a soft X-ray transient source and emits type I X-ray bursts. A spectral state transition was observed with RXTE during its outburst decay in 1997 February and March. Its 10-30 keV and 5-10 keV count rate ratio increased suddenly when its luminosity was between 4 and 12 x 10(35) ergs s(-1), assuming a 2.5 kpc distance. Spectral fitting with a model composed of a blackbody and a power-law component showed that its blackbody component decreased and that the power-law component became much harder significantly and simultaneously. We interpret this transition to be caused by the centrifugal barrier, more commonly known as the "propeller" effect. We thus infer that the magnetic field strength of the neutron star is around 1 x 10(8) G, if the neutron star spin period is 1.8 ms. Similarly, we infer the neutron star magnetic field strength in another soft Xray transient Cen X-4 is about 2 x 10(9) G. We also propose a unified scheme for spectral state transitions in soft X-ray transients, from soft high state to hard low state and further to quiescent state. With this scheme accretion onto neutron star may take place even during the propeller regime.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS记录号WOS:000072156000017
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240292
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Zhang, SN,Yu, W,Zhang, W. Spectral state transitions in Aquila X-1: Evidence for "propeller" effects[J]. ASTROPHYSICAL JOURNAL,1998,494(1):L71-L74.
APA Zhang, SN,Yu, W,&Zhang, W.(1998).Spectral state transitions in Aquila X-1: Evidence for "propeller" effects.ASTROPHYSICAL JOURNAL,494(1),L71-L74.
MLA Zhang, SN,et al."Spectral state transitions in Aquila X-1: Evidence for "propeller" effects".ASTROPHYSICAL JOURNAL 494.1(1998):L71-L74.
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