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Astron. Astrophys. 335, 995-1002 (1998)


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Line profile variability in the spectrum of the O(f) supergiant HD 192639 *

G. Rauw and J.-M. Vreux

Institut d'Astrophysique et de Géophysique, Université de Liège, 5, Avenue de Cointe, B-4000 Liège, Belgium

Received 16 January 1998 / Accepted 16 March 1998

Abstract

We report the results of a medium-resolution spectroscopic investigation of the O(f) supergiant HD 192639. Particular attention is paid to the He ii [FORMULA] 4686 line. This line displays strong profile variability on time scales of a few days, changing from a P-Cygni profile with a double-peaked emission component to a pure blue-shifted emission line. It appears that the variability of most of the absorption lines present in our spectra is correlated to the deformation of the He ii [FORMULA] 4686 line and arises probably from a large scale structure in the low-velocity part of the stellar wind rather than from a photospheric phenomenon. We find that the time scale of the variability could be consistent with the estimated rotational period of HD 192639.

Key words: line: profiles – stars: early-type – stars: mass loss – stars: individual: HD 192639 – stars: variables: other – supergiants

* Based on observations collected at the Observatoire de Haute Provence, France.

Send offprint requests to: G. Rauw

© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998

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