Plasma environment effects on K lines of astrophysical interest: I. Atomic structure, radiative rates, and Auger widths of oxygen ions

Abstract

Aims. In the context of black-hole accretion disks, the main goal of the present study is to estimate the plasma environment effects on the atomic structure and radiative parameters associated with the K-vacancy states in ions of the oxygen isonuclear sequence. Methods. We used a time-averaged Debye-Hückel potential for both the electron-nucleus and the electron-electron interactions implemented in the fully relativistic multiconfiguration Dirac-Fock (MCDF) method. Results. Modified ionization potentials, K thresholds, Auger widths, and radiative transition wavelengths and rates are reported for O I-O VII in plasma environments with electron temperature and density ranges 105-107 K and 1018-1022 cm-3.