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Aims. In the context of black-hole accretion disks, the main goal of thepresent study is to estimate the plasma environment effects on the atomicstructure and radiative parameters associated with the K-vacancy states in ionsof the oxygen isonuclear sequence. Methods. We use a time-averaged Debye-Huckelpotential for both the electron-nucleus and the electron-electron interactionsimplemented in the fully relativistic multiconfiguration Dirac-Fock (MCDF)method. Results. Modified ionization potentials, K thresholds, Auger widths andradiative transition wavelengths and rates are reported for O I - O VII inplasma environments with electron temperature and density ranges 10E5 - 10E7 Kand 10E18 - 10E22 cm-3 .

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