Epoch-dependent absorption line profile variability in lambda Cep

Uuh-Sonda, J. M.; Rauw, Grégor; Eenens, P.; Mahy, Laurent; Palate, Matthieu; Gosset, Eric; Flores, C. A.

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Epoch-dependent absorption line profile variability in lambda Cep

Uuh-Sonda, J. M.; Rauw, Grégor; Eenens, P. et al.

2014 • In Revista Mexicana de Astronomía y Astrofísica, 50, p. 67-76

Peer reviewed

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Keywords :

stars: early-type; stars: individual ($\lambda$ Cep); stars: oscillations; stars: variables: general

Abstract :

[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 :

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

Publication date :

01 April 2014

Journal title :

Revista Mexicana de Astronomía y Astrofísica

ISSN :

0185-1101

Publisher :

Universidad Nacional Autonoma de Mexico, Mexico

Volume :

Pages :

67-76

Peer reviewed :

Peer reviewed

Additional URL :

http://adsabs.harvard.edu/abs/2014RMxAA..50...67U

Available on ORBi :

since 07 April 2014

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