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X-ray temperatures and their radial distributions from winds of O-type supergiants: the effects of clumps
Guo JH(郭建恒)1,2; Guo, JH (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Beijing 100864, Peoples R China.
发表期刊ASTRONOMY & ASTROPHYSICS
2010-03
卷号512
DOI10.1051/0004-6361/200912872
产权排序第1完成单位
收录类别SCI ; EI
关键词Stars: Early Type Stars: Individual: Zeta Ori a Stars: Individual: Zeta Pup X-ray: Stars Stars: Winds Outflows
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.
项目资助者National Natural Science Foundation of China [10803018] ; Chinese Academy of Sciences [07ACX21001, 08AXB31001]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6361
URL查看原文
归档日期2010-06-23
WOS记录号WOS:000276245500041
WOS研究方向Astronomy & Astrophysics
WOS类目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
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5202
专题恒星物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Guo, JH (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Beijing 100864, Peoples R China.
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
第一作者单位中国科学院云南天文台
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Guo JH,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,&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,et al."X-ray temperatures and their radial distributions from winds of O-type supergiants: the effects of clumps".ASTRONOMY & ASTROPHYSICS 512(2010).
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