A new way to measure the departure from thermodynamic equilibrium in stellar atmospheres

doi:10.1088/1674-4527/9/2/009

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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
DOI	10.1088/1674-4527/9/2/009
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
ISSN	1674-4527
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
引用统计
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
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	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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