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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.
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2009-02
Volume9Issue:2Pages:205-212
DOI10.1088/1674-4527/9/2/009
Contribution Rank第1完成单位
Indexed BySCI
KeywordLine: Formation Radiative Transfer Stars: Atmospheres
AbstractA 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.
Funding OrganizationNational Natural Science Foundation of China [10673031] ; National Basic Research Program of China [G2006CB806301]
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN1674-4527
URL查看原文
Archive Date2009-03-03
WOS IDWOS:000264845000009
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCHROMOSPHERIC CONDENSATION ; MAGNETIC-FIELDS ; LINE ; FLARE ; MODEL
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6150
Collection太阳物理研究组
Corresponding AuthorQu, ZQ (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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