Electron density diagnostic for hot plasmas in the coronal regime by using B-like ions

	Electron density diagnostic for hot plasmas in the coronal regime by using B-like ions
	Liang, G. Y.1,2; Zhao, G.1
刊名	ASTRONOMICAL JOURNAL
	2008-06-01
卷号	135 期号:6 页码:2291-2297
关键词	atomic data stars : coronae stars : late-type techniques : spectroscopic X-rays : general
英文摘要	A 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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000256453700030
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8369]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Strathclyde, Dept Phys, Glasgow G1 1XQ, Lanark, Scotland
推荐引用方式 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.