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A new way to measure the departure from thermodynamic equilibrium in stellar atmospheres
Qu ZQ(屈中权)1; Hao LF(郝龙飞)1,2; Yan XL(闫晓理)1,2; Xu, CL3; Qu, ZQ (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2009-02
卷号9期号:2页码:205-212
DOI10.1088/1674-4527/9/2/009
产权排序第1完成单位
收录类别SCI
关键词Line: Formation Radiative Transfer Stars: Atmospheres
摘要A new way to measure the departure from thermodynamic equilibrium is proposed based on the departure factor which evaluates the deviation from a Boltzmann level distribution, used by Short and Hauschildt (2005) and others. The way is based on an explicit relationship describing the departure factor as a function of line to continuum source, dynamic temperature and line photon frequency, under three assumptions that the scattering can be neglected, the background continuum can be treated. as a Planck function, and finally the complete redistribution can be true. It has the advantage,that the departure can be very conveniently evaluated from the spectral analysis with only the radiative transfer involved. Some physical insights are recovered for some extreme cases. Some example calculations of the departure are presented for the quiet Sun, faint solar flare and strong solar flare for the, generally used solar chromospheric lines: H alpha, H beta, Call H, K and triplet. It is revealed that in the case of solar flares, the departure is less than thermodynamic equilibrium along the larger depth range than in the quiet sun due to chromospheric condensation. It becomes hard to distinguish the departures for the different lines of the same atom or ion. It is expected that this investigation can be constructive for studying stellar atmospheres in cases where the three assumptions are close to reality.
项目资助者National Natural Science Foundation of China [10673031] ; National Basic Research Program of China [G2006CB806301]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1674-4527
URL查看原文
归档日期2009-03-03
WOS记录号WOS:000264845000009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CHROMOSPHERIC CONDENSATION ; MAGNETIC-FIELDS ; LINE ; FLARE ; MODEL
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6150
专题太阳物理研究组
通讯作者Qu, ZQ (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位1.Yunnan Astronomical Observatory/National Astronomical Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Graduate School, Chinese Academy of Sciences, Beijing 100049, China
3.Mathematics Department, Yunnan Normal University, Kunming 650122, China
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Qu ZQ,Hao LF,Yan XL,et al. A new way to measure the departure from thermodynamic equilibrium in stellar atmospheres[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(2):205-212.
APA Qu ZQ,Hao LF,Yan XL,Xu, CL,&Qu, ZQ .(2009).A new way to measure the departure from thermodynamic equilibrium in stellar atmospheres.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(2),205-212.
MLA Qu ZQ,et al."A new way to measure the departure from thermodynamic equilibrium in stellar atmospheres".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.2(2009):205-212.
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