Dependence of Spectral State Transition and Disk Truncation on Viscosity Parameter alpha
文献类型：期刊论文
| 作者 | Qiao EL(乔二林)1,2 ; Liu BF(刘碧芳)1
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| 刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
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| 出版日期 | 2009 |
| 卷号 | 61期号:2页码:403-410 |
| 关键词 | accretion, accretion disks X-rays: individual (GX 339-4, GS 2000+251) X-rays: stars |
| ISSN号 | 0004-6264 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Qiao, EL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | A wealth of Galactic accreting X-ray binaries has been observed in both the low/hard and high/soft states. The transition between these two states has often been detected. Observations show that the transition huminosity between these two states is different for different sources, ranging from 1% to 4% of the Eddington luminosity L(Edd). Even for the same source, the transition luminosity at different outbursts call be different. The transition call occur at luminosities from 0.0069 to 0.15 L(Edd). In order to investigate the underlying physics, we study the influence of viscosity parameter alpha on the transition luminosity on the basis of the disk-corona model for black holes. We calculate the mass-evaporation rate for a wide range of viscosity parameters such as 0.1 <= alpha <= 0.9. Fitting the numerical results, we obtain fitting formulae for both the transition accretion rate and the corresponding radius as a function of alpha. We find that the transition luminosity is very sensitive to the value of ce, L/L(Edd) proportional to alpha(2,34). For 0.1 <= alpha <= 0.6, the transition luminosity varies by two orders of magnitude, from 0.001 to 0.2 L(Edd). Comparing with observations, we find that transition luminosity can be fitted by adjusting the value of alpha, and the model-determined values of a are mostly in the range of observationally inferred values. We also investigate the truncation of the disk in the low/hard state for some luminous sources. Our results agree roughly with the observations. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ADVECTION-DOMINATED ACCRETION ; X-RAY BINARIES ; 3-DIMENSIONAL MAGNETOHYDRODYNAMIC SIMULATIONS ; BLACK-HOLE ; THIN DISK ; CORONAL FLOW ; CATACLYSMIC VARIABLES ; VERTICAL STRUCTURE ; GALACTIC NUCLEI ; DWARF NOVAE |
| 收录类别 | SCI |
| 原文出处 | http://pasj.oxfordjournals.org/content/61/2/403 |
| 语种 | 英语 |
| WOS记录号 | WOS:000266228300025 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4990]  |
| 专题 | 云南天文台_高能天体物理研究组 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, P. R. China 2.Graduate School of Chinese Academy of Sciences, Beijing 100049, P. R. China |
| 推荐引用方式 GB/T 7714 | Qiao EL,Liu BF. Dependence of Spectral State Transition and Disk Truncation on Viscosity Parameter alpha[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2009,61(2):403-410. |
| APA | Qiao EL,&Liu BF.(2009).Dependence of Spectral State Transition and Disk Truncation on Viscosity Parameter alpha.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,61(2),403-410. |
| MLA | Qiao EL,et al."Dependence of Spectral State Transition and Disk Truncation on Viscosity Parameter alpha".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 61.2(2009):403-410. |
入库方式： OAI收割
来源：云南天文台
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