X-ray temperatures and their radial distributions from winds of O-type supergiants: the effects of clumps
文献类型：期刊论文
| 作者 | Guo JH(郭建恒)1,2
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| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2010-03 |
| 卷号 | 512 |
| ISSN号 | 0004-6361 |
| 关键词 | stars: early type stars: individual: zeta Ori A stars: individual: zeta Pup stars: winds, outflows X-ray: stars |
| 通讯作者 | Guo, JH (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Beijing 100864, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | Context. Based on the multiphase hydrodynamical flows and the clump model, a two-fluid model of the O stars zeta Ori A and zeta Pup is investigated, in which the flow is described by a set of two components. Aims. I investigate the influence of clumps on the production of X-ray and derive wind parameters from a comparison with the X-ray temperature distributions in the wind of O-type supergiants. Methods. The velocity structure of the clump is assumed to be beta law, thus the transonic velocity structure of the ambient wind can be attained via the shooting method. Results. The mass, filling factor, and velocity structure of the clump are very sensitive to the post-shock temperatures. I find that the filling factor must be about 0.01 for fitting the observed X-ray temperatures. The mass of the clump cannot be smaller than 10(18) g. A clump carries about 10(-4) (M) over dot and 10(-5) (M) over dot for zeta Ori A and zeta Pup, respectively. The model with the exponent of clump velocity beta = 0.5-0.6 for O-type supergiants fits the observations better than one with the exponent beta = 0.8. Conclusions. These results indicate that the forward shock scenario can explain the X-ray emission, except for the hottest X-ray lines for O-type supergiants. Theoretical and observable evidence shows that a low velocity law should be applied to O-type supergiants. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DRIVEN STELLAR WINDS ; XMM-NEWTON OBSERVATIONS ; EMISSION-LINE PROFILES ; MASS-LOSS RATES ; HOT-STAR WINDS ; ZETA-ORIONIS ; DENSE CLUMPS ; TAU SCORPII ; SPECTROSCOPY ; SIGNATURES |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2010/04/aa12872-09/aa12872-09.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000276245500041 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5202]  |
| 专题 | 云南天文台_恒星物理研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Science, PR China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PR China |
| 推荐引用方式 GB/T 7714 | Guo JH. X-ray temperatures and their radial distributions from winds of O-type supergiants: the effects of clumps[J]. ASTRONOMY & ASTROPHYSICS,2010,512. |
| APA | Guo JH.(2010).X-ray temperatures and their radial distributions from winds of O-type supergiants: the effects of clumps.ASTRONOMY & ASTROPHYSICS,512. |
| MLA | Guo JH."X-ray temperatures and their radial distributions from winds of O-type supergiants: the effects of clumps".ASTRONOMY & ASTROPHYSICS 512(2010). |
入库方式： OAI收割
来源：云南天文台
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