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

Abstract

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 μHz). Conclusions. HD 50 209 is a pulsating Be star as expected from its position in the HR diagram, close to the SPB instability strip.

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@inproceedings{Diago2009PulsationsIT, title={Pulsations in the late - type Be star HD 50 209 detected by CoRoT ⋆ , ⋆ ⋆}, author={P . D . Diago and J . Guti{\'e}rrez - Soto and Michel Auvergne and Juan Fabregat and A . - M . Hubert and Michele Floquet and Y . Fr{\'e}mat and Rafael Garrido and Luı́sa Andrade and B . de Batz and M . Di Paolo Emilio and Francisco Espinosa Lara and A . - L . Huat and E . Janot - Pacheco and Ben Leroy and C . Martayan and Coralie Neiner and Toufic Semaan and J . Suso and Claude Catala and Ennio Poretti and Martin Rainer and Koen Uytterhoeven and Estelle Michel and R{\'e}za Samadi and Observatori Astron{\`o}mic de la Universitat de Val{\`e}ncia}, year={2009} }