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Aims. In the context of black-hole accretion disks, we aim to compute theplasma-environment effects on the atomic parameters used to model the decay ofK-vacancy states in moderately charged iron ions, namely Fe ix - Fe xvi.Methods. We used the fully relativistic multiconfiguration Dirac-Fock (MCDF)method approximating the plasma electron-nucleus and electron-electronscreenings with a time-averaged Debye-Huckel potential. Results. We reportmodified ionization potentials, K-threshold energies, wavelengths, radiativeemission rates, and Auger widths for plasmas characterized by electrontemperatures and densities in the ranges $10^5$ - $10^7$ K and $10^{18}$ -$10^{22}$ cm$^{-3}$. Conclusions. This study confirms that the high-resolutionX-ray spectrometers onboard the future XRISM and ATHENA space missions will becapable of detecting the lowering of the K edges of these ions due to theextreme plasma conditions occurring in accretion disks around compact objects.

Plasma-environment effects on K lines of astrophysical interest III. IPs, K thresholds, radiative rates, and Auger widths in Fe ix - Fe xvi