  Using semiclassical perturbation approach in impact approximation, we have
calculated Stark widths for 32 spectral lines of doubly charged argon (Ar III).
Oscillator strengths are calculated using Hartree-Fock method with relativistic
correction (HFR) and an atomic model including 17 configurations. Energy levels
are taken from NIST database. For perturbing levels for which the corresponding
energy does not exist in NIST database, the calculated energies are used. Our
widths are compared with the experimental results. The results presented here
are of interest for modelling and investigation of stellar atmospheres since
argon in different ionization stages is observed in many astrophysical objects.
Finally, the importance of Stark broadening mechanism is studied in the
atmospheric conditions of sdB stars. Electron impact Stark widths are compared
to thermal Doppler widths as a function of temperature and optical depth of
atmospheric layers.
