[en] We present the analysis of a multi-epoch spectroscopic monitoring campaign of the O6 Ief star lambda Cep. Previous observations reported the existence of two modes of non-radial pulsations in this star. Our data reveal a much more complex situation. The frequency content of the power spectrum considerably changes from one epoch to the other. We find no stable frequency that can unambiguously be attributed to pulsations. The epoch-dependence of the frequencies and variability patterns are similar to what is seen in the wind emission lines of this and other Oef stars, suggesting that both phenomena likely have the same, currently still unknown, origin.
Research Center/Unit :
LiSRI - Liège Space Research Institute - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Uuh-Sonda, J. M.; Departamento de Astronomía, Universidad de Guanajuato, Guanajuato, Mexico.)
Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Eenens, P.
Mahy, Laurent ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie > Groupe d'astrophysique des hautes énergies
Palate, Matthieu ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Gosset, Eric ; Université de Liège - ULiège > GAPHE : Astrophysique observationnelle (sol et espace)
Flores, C. A.
Language :
English
Title :
Epoch-dependent absorption line profile variability in lambda Cep
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