Plasma environment effects on K lines of astrophysical interest

摘要

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 10~(5)?10~(7)K and 10~(18)?10~(22)cm~(?3).