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Electron density diagnostic for hot plasmas in the coronal regime by using B-like ions
Liang, G. Y.1,2; Zhao, G.1
2008-06-01
Source PublicationASTRONOMICAL JOURNAL
Volume135Issue:6Pages:2291-2297
AbstractA line ratio of 3d-2p transition lines in boron-like spectra of Si X, S XII, Ar XIV, and Fe XXII has been investigated. Collisional-radiative model calculations reveal that the line ratio is sensitive to the electron density in ranges of n(e) = 4.0 x 10(7)-3.0 x 10(10) cm(-3), 4.0 x 10(8)-3.0 x 10(11) cm(-3), 3.0 x 10(9)-4.0 x 10(12) cm(-3), and 2.0 x 10(12)-3.0 x 10(15) cm(-3), respectively. This complements the K-shell diagnostics of helium-like ions. By a comparison between the predicted and the measured values, effective electron densities in the electron beam ion trap (EBIT) plasmas, performed by Lepson and collaborators at the Lawrence Livermore EBIT, are estimated to be n(e) = 3.4(-0.6)(+0.8) x 10(10) cm(-3) and 5.6(-1.1)(+1.0) x 10(10) cm(-3) for sulfur and argon plasmas, respectively. In the case of argon, a good agreement is shown with the actual electron density derived from an N VI K-shell spectrum. We further explore the 3d-2p transition lines of Si X and S XII in the stellar coronal spectra measured with the low energy transmission grating spectrometer combined with a high resolution camera on board the Chandra X-Ray Observatory. The constrained electron densities show a good agreement with those determined from C V and O VII K-shell spectra.
KeywordAtomic Data Stars : Coronae Stars : Late-type Techniques : Spectroscopic X-rays : General
DOI10.1088/0004-6256/135/6/2291
Indexed BySCI
Language英语
WOS IDWOS:000256453700030
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8369
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Strathclyde, Dept Phys, Glasgow G1 1XQ, Lanark, Scotland
Recommended Citation
GB/T 7714
Liang, G. Y.,Zhao, G.. Electron density diagnostic for hot plasmas in the coronal regime by using B-like ions[J]. ASTRONOMICAL JOURNAL,2008,135(6):2291-2297.
APA Liang, G. Y.,&Zhao, G..(2008).Electron density diagnostic for hot plasmas in the coronal regime by using B-like ions.ASTRONOMICAL JOURNAL,135(6),2291-2297.
MLA Liang, G. Y.,et al."Electron density diagnostic for hot plasmas in the coronal regime by using B-like ions".ASTRONOMICAL JOURNAL 135.6(2008):2291-2297.
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