Optical spectroscopic observations of Cyg X-1=HDE 226868
文献类型：期刊论文
| 作者 | Yan, Jingzhi1 ; Liu, Qingzhong1; Hadrava, Petr2
|
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2008-08-01 |
| 卷号 | 136期号:2页码:631-640 |
| 关键词 | binaries : spectroscopic stars : early-type stars : individual (HDE 226868, Cygnus X-1) stars : winds, outflows X-rays : binaries |
| ISSN号 | 0004-6256 |
| 英文摘要 | We present the results of the spectroscopic observations of HDE 226868, the optical counterpart to the black hole X-ray binary Cyg X-1, from 2001 to 2006. We analyze the variabilities of the two components in the complex Ha line: one P-Cygni shaped component which follows the motion of the supergiant and another emission component moving with an antiphase orbital motion relative to the supergiant, which is attributed to a focused stellar wind. The results of KOREL disentangling of our spectra indicate that the focused stellar wind is responsible for the major part of the variability of the Ha emission line. The emission of the supergiant component had a small difference between the low/hard and high/soft states, while the focused-wind component became strong in the low/hard state and weak in the high/soft state. The wind is nearly undisturbed by the X-ray photoionization during the low/hard state. However, during the high/soft state, the X-rays from the compact object could decelerate the line-driven wind and result in a high-mass accretion rate, due to the effect of the X-ray photoionization. The X-ray illuminating could also change the temperature profile of the stellar wind and increase its temperature, and thus decrease the Ha emissivity of the wind, which could explain the Ha variabilities of Cyg X-1 during different X-ray states. |
| 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] | X-RAY BINARIES ; RADIATION-DRIVEN WINDS ; 226868 = CYGNUS-X-1 ; H-ALPHA EMISSION ; STELLAR WIND ; SPECTRAL VARIABILITY ; INTERMEDIATE STATE ; ORBITAL ELEMENTS ; X-1 ; MASS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000257680000011 |
| 公开日期 | 2011-12-30 |
| 源URL | [http://159.226.72.40/handle/332002/1945]  |
| 专题 | 紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组 |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China 2.Acad Sci Czech Republic, Astron Inst, CZ-14131 Prague, Czech Republic |
| 推荐引用方式 GB/T 7714 | Yan, Jingzhi,Liu, Qingzhong,Hadrava, Petr. Optical spectroscopic observations of Cyg X-1=HDE 226868[J]. ASTRONOMICAL JOURNAL,2008,136(2):631-640. |
| APA | Yan, Jingzhi,Liu, Qingzhong,&Hadrava, Petr.(2008).Optical spectroscopic observations of Cyg X-1=HDE 226868.ASTRONOMICAL JOURNAL,136(2),631-640. |
| MLA | Yan, Jingzhi,et al."Optical spectroscopic observations of Cyg X-1=HDE 226868".ASTRONOMICAL JOURNAL 136.2(2008):631-640. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。