Article Dans Une Revue Astronomy & Astrophysics - A&A Année : 2009

Pulsations in the late-type Be star HD 50 209 detected by CoRoT

Résumé

Context: The presence of pulsations in late-type Be stars is still a matter of controversy. It constitutes an important issue to establish the relationship between non-radial pulsations and the mass-loss mechanism in Be stars.
Aims: To contribute to this discussion, we analyse the photometric time series of the B8IVe star HD 50 209 observed by the CoRoT mission in the seismology field.
Methods: We use standard Fourier techniques and linear and non-linear least squares fitting methods to analyse the CoRoT light curve. In addition, we applied detailed modelling of high-resolution spectra to obtain the fundamental physical parameters of the star.
Results: We have found four frequencies which correspond to gravity modes with azimuthal order m=0,-1,-2,-3 with the same pulsational frequency in the co-rotating frame. We also found a rotational period with a frequency of 0.679 cd-1 (7.754 muHz).
Conclusions: HD 50 209 is a pulsating Be star as expected from its position in the HR diagram, close to the SPB instability strip.

Dates et versions

hal-03732529 , version 1 (21-07-2022)

Identifiants

Citer

Pascual Diago, Juan Gutiérrez, Michel Auvergne, Juan Fabregat, Anne-Marie Hubert, et al.. Pulsations in the late-type Be star HD 50 209 detected by CoRoT. Astronomy & Astrophysics - A&A, 2009, 506, pp.125-131. ⟨10.1051/0004-6361/200911901⟩. ⟨hal-03732529⟩
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