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 (sahal@obspm.fr)

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

Abstract:

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