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Issue A&A
Volume 404, Number 3, June IV 2003
Page(s) 1099 - 1106
Section Formation and evolution of planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20030561



A&A 404, 1099-1106 (2003)
DOI: 10.1051/0004-6361:20030561

On the influence of Stark broadening on Si I lines in stellar atmospheres

M. S. Dimitrijevic1, 2, T. Ryabchikova3, 4, L. C. Popovic1, 2, D. Shulyak5 and V. Tsymbal5

1  Astronomical Observatory, Volgina 7, 11160 Belgrade 74, Serbia
2  Isaac Newton Institute of Chile, Yugoslavia Branch
3  Institute of Astronomy, Russian Academy of Science, Pyatnitskaya 48, 119017 Moscow, Russia
4  Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
5  Tavrian National University, Yaltinskaya 4, 330000 Simferopol, Crimea, Ukraine

(Received 12 November 2002 / Accepted 27 March 2003 )

Abstract
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 Åand 6155.13 Ålines are asymmetrical and shifted. First we have calculated Stark broadening parameters using the semiclassical perturbation method for three Si I lines: 5950.2 Å, 6142.48 Åand 6155.13 Å. 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 Si I 6142.48 Å and 6155.13 Å lines in the atmospere of roAp star 10 Aql.


Key words: stars: chemically peculiar -- line: profiles -- atomic processes

Offprint request: M. S. Dimitrijevic, mdimitrijevic@aob.bg.ac.yu

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