The aim of this research is to investigate the presence of He I forbidden lines and their relation with the luminosity class in order to check different mechanisms that may contribute to the line formation process. Through the analysis of high resolution and high signal/noise spectra, obtained with the échelle spectrograph at CASLEO, we carried out a systematic study of the presence of He I forbidden lines in B stars of different spectral and luminosity classes. We have analysed a large set of spectra ranging from B0 to B5 and belonging to luminosity classes Ia to V. Our preliminary results indicate that the Stark effect seems not to offer a complete explanation for the observed intensities of the forbidden lines.
Boletin de la Asociacion Argentina de Astronomia La Plata Argentina
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