Stark profiles of infrared helium lines

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

Send offprint request to: S. Sahal-Bréchot

Received: 20 April 1998
Accepted: 29 May 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.