Improved NLTE profiles of He II lines in hot stars including their overlap with hydrogen
The accelerated Lambda iteration method is used to obtain better theoretical profiles of He II in hot stars by considering more levels and Stark broadening in the statistical equilibrium equations. It is found that an appropriate He II model atom must consist of 14 non-LTE levels and that Stark broadening must be included for all lines with upper
Herrero, A.
Fecha de publicación:
11
1987