2006/06/13 by G. Y. Liang, G. Zhao, Gang Zhao
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Effective temperature #Emission spectrum #Line (geometry) #Nuclear physics #Optics #Physics #Plasma #Resolution (logic) #Spectral line #Stars #Stellar, planetary, and galactic studies #Wavelength #X-ray #astro-ph
paper · pdf · doi:10.1086/506615
published as Astron.J.132:1547-1554,2006 · 21 pages, 6 figures, Accepted in AJ
arxiv created 2006/06/13 · openalex publication_date 2006/09/05 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/08
We study the temperature and density sensitivities of the ratios of Si XI soft X-ray emission lines in the wavelength range of 43-54 Å. The typical temperature of formation of the analyzed lines is around 1.6 MK, which makes this analysis complementary to the analysis of He-like triplets, which are sensitive to hotter plasma. We present theoretical calculations and compare them with ratios obtained from high-resolution X-ray spectra of five solar-like stars: Procyon, α Cen A, α Cen B, Eri, and Capella. We find that our results are in good agreement with results obtained by other authors through different diagnostics, namely, the analysis of density- and temperature-sensitive He-like triplet lines. We further estimate the coronal pressure and filling factors from Si XI lines in this study.