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Astron. Astrophys. 317, 185-192 (1997)

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Circumstellar peculiarities in the unusual Be star HD 50138 *

M.A. Pogodin

Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, 196140 Saint-Petersburg, Russia (e-mail: pogodin@pulkovo.spb.su)

Received 23 October 1995 / Accepted 14 May 1996

Abstract

Ninety-two high-resolution spectra of the peculiar Be star HD 50138 have been obtained in two spectral regions encompassing the lines He I 5876 , DNa I and H [FORMULA]. The profiles of the H [FORMULA] and DNa I lines display a number of blue-shifted shell components overlapping the intense emission. Rapid variability of these lines favours a discrete structure 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 complex and variable. The analysis of its variability has shown that circumstellar gas in the vicinity of the star contains both outflows and accretion zones. The DNa I emission components are very asymmetric with line-centre positions being displaced to about [FORMULA]. This is probably connected with an opaque circumstellar disk in the remote envelope. Obvious similarity of circumstellar peculiarities in HD 50138 and some young Herbig stars is noted.

Key words: line: profiles — stars: circumstellar matter — stars: individual: (HD 50138) — stars: mass loss — stars

* Based on observations collected at the European Southern Observatory, La Silla, Chile

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