Abstract
We present in this paper quantum Stark broadening data for 14 Ar VIII and 16 Ar IX lines. For the Ar VIII ion, we compare our results to those calculated using the semiclassical method and we find an acceptable agreement. We performed also a comparison between the importance of Stark and Doppler broadening in the atmospheric conditions of DO white dwarfs. To the best of our knowledge, the Stark widths provided for the Ar IX ion are new, and no results have been found in the literature to compare with. We present some of the atomic radiative data used in our broadening calculations, and we compare them to other results. The comparison shows an acceptable agreement. Our results come to fill the lack of line broadening data necessary in stellar spectroscopy and plasma analysis.