机译:Primordial 4He abundance: a determination based on the largest sample of H II regions with a methodology tested on model H II regions
LUTH, Observatoire de Meudon, 92195 Meudon Cedex, France;
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany;
galaxies: abundances; galaxies: irregular; galaxies: evolution; galaxies: formation; HII regions; ISM: abundances;