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

• Published in: Astronomy and astrophysics (Berlin) Vol. 624; no. A74; p. A74
• Main Authors: Deprince, J., Bautista, M. A., Fritzsche, S., García, J. A., Kallman, T. R., Mendoza, C., Palmeri, P., Quinet, P.
• Format: Journal Article Web Resource
• Language: English
• Published: Goddard Space Flight Center European Southern Observatory (ESO) / EDP Sciences 12.04.2019; EDP Sciences
• Subjects: Astronomy; Astrophysics; Physical, chemical, mathematical & earth Sciences; Physics; Physique; Physique, chimie, mathématiques & sciences de la terre
• ISSN: 0004-6361; 1432-0746; 1432-0746
• DOI: 10.1051/0004-6361/201935075

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(exp 5)−10(exp 7) K and 10(exp 18)−10(exp 22)/cu.cm.