SIMBAD references

2001A&A...366..585R - Astronomy and Astrophysics, volume 366, 585-597 (2001/2-1)

The spectral variability of HD 192639 and its implications for the star's wind structure.


Abstract (from CDS):

We report the analysis of an extensive set of spectroscopic data of the O(f) supergiant HD 192639. A Fourier analysis of our time-series reveals a recurrent variability with a ``period'' of roughly 4.8 days which is most prominent in the absorption components of the He II λ 4686 and Hα P-Cygni profiles. The same periodicity is also detected in the blue wing of several absorption lines (e.g. Hβ). The variations of the absorption components correspond most probably to a cyclical modulation of the amount of stellar wind material along the line of sight towards the star. The 4.8-day period affects also the morphology of the double-peaked He II λ 4686 and Hα emission components, although these emission components display also variations on other (mainly longer) time scales. The most likely explanation for the 4.8-day modulation is that this cycle reflects the stellar rotational period (or half this period). We find that the most important observational properties can be explained - at least qualitatively - by a corotating interaction region or a tilted confined corotating wind.

Abstract Copyright:

Journal keyword(s): line: profiles - stars: early-type - stars: mass loss - stars: individual: HD 192639 - stars: variables: general

Simbad objects: 10

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