SIMBAD references

We study the influence of Stark broadening and stratification effects on Sii lines in the rapidly oscillating (roAp) star 10 Aql, where the Sii6142.48Å and 6155.13Å lines are asymmetrical and shifted. First we have calculated Stark broadening parameters using the semiclassical perturbation method for three Sii lines: 5950.2Å, 6142.48Å and 6155.13Å. We revised the synthetic spectrum calculation code taking into account both Stark width and shift for these lines. From the comparison of our calculations with the observations we found that Stark broadening + the stratification effect can explain asymmetry of the Sii 6142.48Å and 6155.13Å lines in the atmospere of roAp star 10 Aql.