[en] It has been proposed that the variability seen in absorption lines of the O6Ief star λ Cep is periodical and due to non-radial pulsations (NRP). We have obtained new spectra during six campaigns lasting between five and nine nights. In some datasets we find recurrent spectral variations which move redward in the absorption line profile, consistent with perturbations on the stellar surface of a rotating star. However the periods found are not stable between datasets, at odds with the NRP hypothesis. Moreover, even when no redward trend is found in a full dataset of an observing campaign, it can be present in a subset, suggesting that the phenomenon is short-lived, of the order of a few days, and possibly linked to transient magnetic loops.
Centre/Unité de recherche :
LiSRI - Liège Space Research Institute - ULiège
Disciplines :
Aérospatiale, astronomie & astrophysique
Auteur, co-auteur :
Uuh-Sonda, J. M.; Departamento de Astronomía, Universidad de Guanajuato, Apdo. Postal 144, 36000, Guanajuato, Guanajuato, Mexico , eenens@ugto.mx
Eenens, P.; Departamento de Astronomía, Universidad de Guanajuato, Apdo. Postal 144, 36000, Guanajuato, Guanajuato, Mexico , eenens@ugto.mx
Rauw, Grégor ; Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Langue du document :
Anglais
Titre :
Is λ Cep a pulsating star?
Date de publication/diffusion :
01 janvier 2015
Nom de la manifestation :
New windows on massive stars: asteroseismology, interferometry and spectropolarimetry
Organisateur de la manifestation :
International Astronomical Union
Lieu de la manifestation :
Geneva, Suisse
Date de la manifestation :
June 2014
Manifestation à portée :
International
Titre du périodique :
Proceedings of the International Astronomical Union
ISSN :
1743-9213
eISSN :
1743-9221
Maison d'édition :
Cambridge University Press, Cambridge, Royaume-Uni
