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astro-ph.SR2026
R-matrix calculations for opacities: V. Temperature-density dependence of photoabsorption cross sections and opacity spectra of oxygen ions O VI and O VII
Divya Chari, Sultana N Nahar, Anil K Pradhan
We present R-matrix photoabsorption cross sections for Li-like oxygen O VI and He-like oxygen O VII and examine how plasma broadening modifies them as a function of temperature and…
astro-ph.GA2026
Emissivity line ratios for [Mn III] and spectral diagnostics of H II regions
Zher Samak, Sultana N. Nahar, Anil K. Pradhan
We present the first theoretical emission-line study of Mn III as potential determinant of physical conditions and manganese abundance. We compute atomic data for a set of Mn III l…