Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-22
Astron.Astrophys. 404 (2003) 1099-1106
Astronomy and Astrophysics
Astrophysics
Accepted to A&A
Scientific paper
10.1051/0004-6361:20030561
We study the influence of Stark broadening and stratification effects on Si\i lines in the rapidly oscillating (roAp) star 10 Aql, where the Si\i 6142.48 \AA and 6155.13 \AA lines are asymmetrical and shifted. First we have calculated Stark broadening parameters using the semiclassical perturbation method for three Si\i lines: 5950.2 \AA, 6142.48 \AA and 6155.13 \AA. We revised the synthetic sp$ 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 Si\i 6142.48 \AA and 6155.13 \AA lines in the atmospere of roAp star 10 Aql.
Dimitrijevic Milan S.
Popovic Luka C.
Ryabchikova Tanya
Shulyak Denis
Tsymbal V. V.
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