MULTIBAND STUDIES OF THE OPTICAL PERIODIC MODULATION IN THE X-RAY BINARY SAX J1808.4-3658 DURING ITS QUIESCENCE AND 2008 OUTBURST
文献类型：期刊论文
| 作者 | Wang, Zhongxiang1 ; Breton, Rene P.2,3; Heinke, Craig O.4; Deloye, Christopher J.4; Zhong, Jing1,5
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-03-10 |
| 卷号 | 765期号:2页码:1 |
| 关键词 | binaries: close stars: individual (SAX J1808.4-3658) stars: low-mass stars: neutron X-rays: binaries |
| 英文摘要 | We report on time-resolved optical imaging of the X-ray binary SAX J1808.4-3658 during its quiescent state and 2008 outburst. The binary, containing an accretion-powered millisecond pulsar, has a large sinusoidal-like modulation in its quiescent optical emission. We employ a Markov chain Monte Carlo technique to fit our multi-band light curve data in quiescence with an irradiated star model, and derive a tight constraint of 50(-5)(+6) deg on the inclination angle i of the binary system. The pulsar and its companion are constrained to have masses of 0.97(-0.22)(+0.31) M-circle dot and 0.04(-0.01)(+0.02) M-circle dot (both 1 sigma ranges), respectively. The dependence of these results on the measurements of the companion's projected radial velocity is discussed. We also find that the accretion disk had nearly constant optical fluxes over a similar to 500 day period in the quiescent state our data covered, but started brightening 1.5 months before the 2008 outburst. Variations in modulation during the outburst were detected in our four observations made 7-12 days after the start of the outburst, and a sinusoidal-like modulation with 0.2 mag amplitude changed to have a smaller amplitude of 0.1 mag. The modulation variations are discussed. We estimate the albedo of the companion during its quiescence and the outburst, which was approximately 0 and 0.8 (for isotropic emission), respectively. This large difference probably provides additional evidence that the neutron star in the binary turns on as a radio pulsar in quiescence. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | POWERED MILLISECOND PULSAR ; MASSIVE NEUTRON-STAR ; ACTIVE RADIO PULSAR ; XMM-NEWTON ; MODEL ATMOSPHERES ; ORBITAL EVOLUTION ; IGR J00291+5934 ; LIGHT-CURVE ; BLACK-WIDOW ; SPIN-DOWN |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000315921500076 |
| 源URL | [http://119.78.226.72/handle/331011/18062]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England 3.Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada 4.Univ Alberta, Dept Phys, Edmonton, AB T6G 2G7, Canada 5.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Zhongxiang,Breton, Rene P.,Heinke, Craig O.,et al. MULTIBAND STUDIES OF THE OPTICAL PERIODIC MODULATION IN THE X-RAY BINARY SAX J1808.4-3658 DURING ITS QUIESCENCE AND 2008 OUTBURST[J]. ASTROPHYSICAL JOURNAL,2013,765(2):1. |
| APA | Wang, Zhongxiang,Breton, Rene P.,Heinke, Craig O.,Deloye, Christopher J.,&Zhong, Jing.(2013).MULTIBAND STUDIES OF THE OPTICAL PERIODIC MODULATION IN THE X-RAY BINARY SAX J1808.4-3658 DURING ITS QUIESCENCE AND 2008 OUTBURST.ASTROPHYSICAL JOURNAL,765(2),1. |
| MLA | Wang, Zhongxiang,et al."MULTIBAND STUDIES OF THE OPTICAL PERIODIC MODULATION IN THE X-RAY BINARY SAX J1808.4-3658 DURING ITS QUIESCENCE AND 2008 OUTBURST".ASTROPHYSICAL JOURNAL 765.2(2013):1. |
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来源：上海天文台
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