Article (Scientific journals)
The spectral variability of HD 192639 and its implications for the star's wind structure
Rauw, Grégor; Morrison, N. D.; Vreux, Jean-Marie et al.
2001In Astronomy and Astrophysics, 366, p. 585-597
Peer Reviewed verified by ORBi
 

Files


Full Text
aa10162.pdf
Publisher postprint (506.18 kB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
LINE: PROFILES; STARS: EARLY-TYPE; STARS: MASS LOSS; STARS: INDIVIDUAL: HD 192639; STARS: VARIABLES: GENERAL
Abstract :
[en] 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}\ lambda 4686 and Halpha P-Cygni profiles. The same periodicity is also detected in the blue wing of several absorption lines (e.g. Hbeta ). 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}\ lambda 4686 and Halpha 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. Based on observations collected at the Observatoire de Haute Provence, France and the Ritter Observatory, Toledo, USA.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Morrison, N. D.;  Ritter Astrophysical Research Center, Toledo, OH 43606, USA
Vreux, Jean-Marie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO)
Gosset, Eric ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Mulliss, C. L.;  Ritter Astrophysical Research Center, Toledo, OH 43606, USA
Language :
English
Title :
The spectral variability of HD 192639 and its implications for the star's wind structure
Publication date :
01 February 2001
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
366
Pages :
585-597
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 July 2009

Statistics


Number of views
38 (0 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
16
Scopus citations®
without self-citations
8
OpenCitations
 
19

Bibliography


Similar publications



Contact ORBi