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Article (Scientific journals)
Line profile variability in the spectra of Oef stars. I. BD + 60deg 2522
Rauw, Grégor; De Becker, Michaël; Vreux, Jean-Marie
2003In Astronomy and Astrophysics, 399, p. 287-296
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Keywords :
line: profiles; stars: early-type; stars: mass-loss; stars: individual: BD +60deg 2522; stars: variables: general
Abstract :
[en] We report the analysis of a long term observing campaign designed to monitor the spectroscopic variability of the Oef star BD +60deg 2522. We find that the double-peaked He {II} lambda 4686 emission line undergoes strong profile variability on time scales of 2-3 day. However, the time scale as well as the pattern of these variations turn out to be epoch dependent and the phenomenon is thus most likely not ruled by a single stable clock. On the other hand, the absorption lines in the spectrum of BD +60deg 2522 display line profile variability on time scales of a few hours that might be related to non-radial pulsations. We tentatively propose that the beating of several non-radial pulsation modes triggers transient large-scale density perturbations in a confined stellar wind that produce the 2-3 day time scale variability.
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
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Vreux, Jean-Marie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
Line profile variability in the spectra of Oef stars. I. BD + 60deg 2522
Publication date :
February 2003
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
399
Pages :
287-296
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 January 2009

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