Pulsations in the late-type Be star HD 50209 detected by CoRoT
Abstract
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. To contribute to this discussion, we analyse the photometric time series of the B8IVe star HD 50209 observed by the CoRoT mission in the seismology field. 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. 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 (7.754 Hz). HD 50209 is a pulsating Be star as expected from its position in the HR diagram, close to the SPB instability strip.
Cite
@article{arxiv.0909.4524,
title = {Pulsations in the late-type Be star HD 50209 detected by CoRoT},
author = {P. D. Diago and J. Gutierrez-Soto and M. Auvergne and J. Fabregat and A. -M. Hubert and M. Floquet and Y. Fremat and R. Garrido and L. Andrade and B. de Batz and M. Emilio and F. Espinosa-Lara and A. -L. Huat and E. Janot-Pacheco and B. Leroy and C. Martayan and C. Neiner and T. Semaan and J. Suso and C. Catala and E. Poretti and M. Rainer and K. Uytterhoeven and E. Michel and R. Samadi},
journal= {arXiv preprint arXiv:0909.4524},
year = {2015}
}
Comments
7 pages, 8 figures, accepted fot publication in the A&A CoRoT special feature