Radiative Opacity in Stellar Atmospheres. I. Metal Absorption Coefficients

Abstract

view Abstract Citations (69) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radiative Opacity in Stellar Atmospheres. I. Metal Absorption Coefficients Travis, Larry D. ; Matsushima, Satoshi Abstract The results of numerical computations of the atomic absorption coefficients due to the elements C, N, 0, Na, Mg, Al, Si, Cr, Fe, and Ni are presented. The quantum defect method is used for the determina- tion of the photo-ionization cross-sections except in the cases of Cr, Fe, and Ni For these metals, detailed hydrogenic approximations are used owing to the inapplicability of the quantum defect method when LS coupling is not valid These cross-sections are used to compute the atomic absorption coefficients for temperatures ranging from 0 = 1 38 to 0 = 036, with an interval of M = 006, and a range in wave- lengths of XX1033-59958. The random errors involved in the empirical determination of the quantum defect are found to be comparable to the accuracy of the computed cross-sections estimated from com- parisons with experimentally determined values. Finally, the relative importance of metal absorptions in radiative opacity is examined for the atmospheric conditions of the solar-type and other spectral classes. I. INTRODUCTIO Publication: The Astrophysical Journal Pub Date: November 1968 DOI: 10.1086/149790 Bibcode: 1968ApJ...154..689T full text sources ADS | Related Materials (2) Part 2: 1968ApJ...154..715M Part 3: 1969ApJ...156..183M