CIRCUMSTELLAR PECULIARITIES IN THE UNUSUAL BE STAR HD-50138

Ninety-two high-resolution spectra of the peculiar Be star HD 50138 ha ve been obtained in two spectral regions encompassing the lines He I 5 876, DNa I and H alpha. The profiles of the H alpha and DNa I lines di splay a number of blue-shifted shell components overlapping the intens e emission. Rapid variability of these lines favours a discrete struct ure of the remote stellar wind and an extensive shell containing local condensations. In the He I 5876 line, which is probably formed in the chromosphere near the stellar surface, the type of profile is more co mplex and variable. The analysis of its variability has shown that cir cumstellar gas in the vicinity of the star contains both outflows and accretion zones. The DNa I emission components are very asymmetric wit h line-centre positions being displaced to about -50 km s(-1). This is probably connected with an opaque circumstellar disk in the remote en velope. Obvious similarity of circumstellar peculiarities in HD 50138 and some young Herbig stars is noted.