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Gravitational settling in pulsating subdwarf B stars and their progenitors
Haili Hu, E. Glebbeek, A. A. Thoul +4
Diffusion of atoms can be important during quiescent phases of stellar evolution. Particularly in the very thin inert envelopes of subdwarf B stars, diffusive movements will consid…
The CoRoT target HD 49933: 2- Comparison of theoretical mode amplitudes with observations
R. Samadi, H. -G. Ludwig, K. Belkacem +7
From the seismic data obtained by CoRoT for the star HD 49933 it is possible, as for the Sun, to constrain models of the excitation of acoustic modes by turbulent convection. We co…
The CoRoT target HD 49933: 1- Role of the metal abundance
R. Samadi, H. -G. Ludwig, K. Belkacem +2
Solar-like oscillations are stochastically excited by turbulent convection at the surface layers of the stars. We study the role of the surface metal abundance on the efficiency of…
Solar-like oscillations in massive main-sequence stars. I. Asteroseismic signatures of the driving and damping regions
K. Belkacem, M. A. Dupret, A. Noels
Motivated by the recent detection of stochastically excited modes in the massive star V1449 Aql (Belkacem et al., 2009b), already known to be a Cephei, we theoretically investi…
Hybrid gamma Doradus/delta Scuti Stars: Comparison Between Observations and Theory
M. -P. Bouabid, J. Montalban, A. Miglio +3
Gamma Doradus are F-type stars pulsating with high order g-modes. Their instability strip (IS) overlaps the red edge of the delta Scuti one. This observation has led to search for…
Impact of helium diffusion and helium-flash-induced carbon production on gravity-mode pulsations in subdwarf B stars
Haili Hu, Gijs Nelemans, Conny Aerts +1
Realistic stellar models are essential to the forward modelling approach in asteroseismology. For practicality however, certain model assumptions are also required. For example, in…