Article (Scientific journals)
Line profile variability in the spectrum of the O(f) supergiant HD 192639
Rauw, Grégor; Vreux, Jean-Marie
1998In Astronomy and Astrophysics, 335, p. 995-1002
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Keywords :
LINE: PROFILES; STARS: EARLY-TYPE; STARS: MASS LOSS; STARS: INDIVIDUAL: HD 192639; STARS: VARIABLES: OTHER; SUPERGIANTS
Abstract :
[en] 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}\ lambda 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}\ lambda 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. Based on observations collected at the Observatoire de Haute Provence, France.
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
Vreux, Jean-Marie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
Line profile variability in the spectrum of the O(f) supergiant HD 192639
Publication date :
01 July 1998
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
335
Pages :
995-1002
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 July 2009

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