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Stochastic excitation of gravity modes in massive main-sequence stars

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Abstract

We investigate the possibility that gravity modes can be stochastically excited by turbulent convection in massive main-sequence (MS) stars. We build stellar models of MS stars with masses M=10 M ⊙,15 M ⊙, and 20 M ⊙. For each model, we then compute the power supplied to the modes by turbulent eddies in the convective core (CC) and the outer convective zones (OCZ). We found that, for asymptotic gravity modes, the major part of the driving occurs within the outer iron convective zone, while the excitation of low n order modes mainly occurs within the CC. We compute the mode lifetimes and deduce the expected mode amplitudes. We finally discuss the possibility of detecting such stochastically-excited gravity modes with the CoRoT space-based mission.

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Authors and Affiliations

  1. Observatoire de Paris, LESIA, CNRS UMR 8109, 92195, Meudon, France

    R. Samadi & M. J. Goupil

  2. Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17-B, 4000, Liège, Belgium

    K. Belkacem, M.-A. Dupret & A. Noels

  3. DSM/DAPNIA/SAp, CEA Saclay, 91191, Gif-sur-Yvette Cedex, France

    A. S. Brun

Authors
  1. R. Samadi
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  2. K. Belkacem
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  3. M. J. Goupil
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  4. M.-A. Dupret
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  5. A. S. Brun
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  6. A. Noels
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Correspondence to R. Samadi.

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Samadi, R., Belkacem, K., Goupil, M.J. et al. Stochastic excitation of gravity modes in massive main-sequence stars. Astrophys Space Sci 328, 253–258 (2010). https://doi.org/10.1007/s10509-009-0215-3

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  • DOI: https://doi.org/10.1007/s10509-009-0215-3

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