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Is λ Cep a pulsating star?

Published online by Cambridge University Press:  23 January 2015

J.M. Uuh-Sonda ,
P. Eenens  and
G. Rauw
J.M. Uuh-Sonda
Affiliation:
Departamento de Astronomía, Universidad de Guanajuato, Apdo. Postal 144, 36000, Guanajuato, Guanajuato, Mexico email: [email protected], [email protected]
P. Eenens
Affiliation:
Departamento de Astronomía, Universidad de Guanajuato, Apdo. Postal 144, 36000, Guanajuato, Guanajuato, Mexico email: [email protected], [email protected]
G. Rauw
Affiliation:
Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 400 Liège, Belgium email: [email protected]
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Abstract

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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.

Keywords

stars: early-typestars: oscillationsstars: spotsstars: rotationstars: individual (λ Cep)stars: variables: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 237 - 238
Copyright
Copyright © International Astronomical Union 2015 

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