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Astron. Astrophys. 350, 719-724 (1999)

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The electron-impact broadening effect in CP stars: the case of La II, La III, Eu II, and Eu III lines

L.C. Popovic 1, M.S. Dimitrijevic 1 and T. Ryabchikova 2,3

1 Astronomical Observatory, Volgina 7, 11160 Belgrade 74, Yugoslavia
2 Institute of Astronomy of the Russian Academy of Sciences, Pyatnitskaya 48, 109017 Moscow, Russia (ryabchik@inasan.rssi.ru)
3 Visiting scientist, Institute for Astronomy, Vienna University, Tuerkenschanzstrasse 17, 1180 Wien, Austria

Received 22 March 1999 / Accepted 26 August 1999


The electron-impact widths and shifts for six Eu II lines and widths for three La II, and six La III multiplets have been calculated by using the modified semiempirical method. Estimation for Stark widths of 664.506 nm (Eu II ) and 666.634 nm (Eu III ) lines are given as well. The influence of the electron-impact mechanism on line shapes and equivalent widths in hot star atmospheres has been considered.

Key words: atomic data – plasmas – stars: chemically peculiar

Send offprint requests to: L.C. Popovic (lpopovic@aob.bg.ac.yu)

© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999