Time-dependent convection seismic study of five gamma Doradus stars

Marc-Antoine Dupret (1, 2, 3) , A. Grigahcène (1) , Rafael Garrido (1) , Joris de Ridder (4) , Richard Scuflaire (5) , M. Gabriel (5)

1 IAA - Instituto de Astrofísica de Andalucía
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 Pôle Astronomie du LESIA
4 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven
5 Institut d'Astrophysique, Géophysique et Océanographie, Université de Liège

We apply for the first time the time-dependent convection (TDC) treatment of Gabriel and Grigahcène et al. to the photometric mode identification in gamma Doradus (gamma Dor) stars. We consider the influence of this treatment on the theoretical amplitude ratios and phase differences. Comparison with the observed amplitudes and phases of the stars gamma Dor, 9 Aurigae, HD 207223 = HR 8330, HD 12901 and 48501 is presented and enables us to identify the degree l of the pulsation modes for four of them. We also determine the mode stability for different models of these stars. We show that our TDC models agree better with observations than with frozen convection models. Finally, we compare the results obtained with different values of the mixing-length parameter alpha.

Domaines: Astrophysique [astro-ph]

Marc-Antoine Dupret, A. Grigahcène, Rafael Garrido, Joris de Ridder, Richard Scuflaire, et al.. Time-dependent convection seismic study of five gamma Doradus stars. Monthly Notices of the Royal Astronomical Society, 2005, 360, pp.1143-1152. ⟨10.1111/j.1365-2966.2005.09114.x⟩. ⟨hal-03785060⟩