Reference : Stochastic excitation of gravity modes in massive main-sequence stars
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/75527
Stochastic excitation of gravity modes in massive main-sequence stars
English
Samadi, R. [Observatoire de Paris, LESIA, CNRS UMR 8109]
Belkacem, Kevin [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Goupil, M. J. [Observatoire de Paris, LESIA, CNRS UMR 8109]
Dupret, Marc-Antoine [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Brun, A. S. [DSM/DAPNIA/SAp]
Noels-Grötsch, Arlette [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
1-Jul-2010
Astrophysics & Space Science
328
253-258
Yes (verified by ORBi)
International
0004-640X
[en] Turbulence ; Convection ; Oscillations ; Mode driving ; Massive stars
[en] 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 [SUB]ȯ[/SUB],15 M [SUB]ȯ[/SUB], and 20 M [SUB]ȯ[/SUB]. 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.
http://hdl.handle.net/2268/75527
10.1007/s10509-009-0215-3
http://adsabs.harvard.edu/abs/2010Ap%26SS.328..253S

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