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Astron. Astrophys. Suppl. Ser. 133, 229-244

Stark profiles of infrared helium lines

N. Terzi 1 - S. Sahal-Bréchot2 - Z. Ben Lakhdar 1

Send offprint request: S. Sahal-Bréchot (

1 - Laboratoire de Physique Atomique et Moléculaire, Département de Physique, Faculté des Sciences de Tunis, 1060 Campus Universitaire, Tunis, Tunisie
2 - Laboratoire "Atomes et Molécules en Astrophysique'', Unité associée au CNRS 812, Département Atomes et Molécules en Astrophysique, Observatoire de Paris-Meudon, 92195 Meudon Cedex, France

Received April 20; accepted May 29, 1998


We have calculated Stark widths and shifts of some infrared helium lines that are missing and that are important for modellisation of the atmospheres of hot early-type stars. These calculations are based on the impact and quasistatic theory and semi-classical approximation. The provided data are displayed for a grid of temperatures (104 to 105 K) and electron densities (1010 to 1013 cm-3) typical of hot early-type stars. We also discuss the conditions of use of our data for astrophysical purposes.

Key words: stars: early-type -- infrared: general -- atomic data -- lines: profiles

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