On the spectrum of HII regions

In: Bulletin de la Classe des Sciences de l'Académie Royale de Sciences, des Lettres et des Beaux-Arts de Belgique, Band 65, Heft 1, S. 16-30

Abstract

It is shown that the validity of present models of HII regions is not well established. One has to recognize the importance of several effects which may account for some peculiar spectral features such as the bright [SII] lines and the anomalous atomic abundances found in several cases.