[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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Samadi, R.; Observatoire de Paris, LESIA, CNRS UMR 8109
Belkacem, Kevin ; Université de Liège - ULiège > 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 - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Brun, A. S.; DSM/DAPNIA/SAp
Noels-Grötsch, Arlette ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
Stochastic excitation of gravity modes in massive main-sequence stars
Belkacem, K., Samadi, R., Goupil, M. J., Kupka, F., Baudin, F.: Astron. Astrophys. 460, 183 (2006).
Belkacem, K., Samadi, R., Goupil, M. J., Dupret, M. A.: Astron. Astrophys. 478, 163 (2008).
Belkacem, K., Samadi, R., Goupil, M. J., Lefèvre, L., Baudin, F., Deheuvels, S., Dupret, M. A., Appourchaux, T., Scuflaire, R., Auvergne, M., Catala, C., Michel, E., Miglio, A., Montalban, J., Thoul, A., Talon, S., Baglin, A., Noels, A.: Science 324, 1540 (2009a).
Belkacem, K., Samadi, R., Goupil, M. J., Dupret, M. A., Brun, A. S., Baudin, F.: Astron. Astrophys. 494, 191 (2009b).
Belkacem, K., Dupret, M. A., Noels, A.: Astron. Astrophys. (2009c, in press). arXiv: 0911. 0908.
Browning, M. K., Brun, A. S., Toomre, J.: Astrophys. J. 601, 512 (2004).
Chaplin, W. J., Houdek, G., Elsworth, Y., Gough, D. O., Isaak, G. R., New, R.: Mon. Not. R. Astron. Soc. 360, 859 (2005).
Dupret, M. A.: Bull. Soc. R. Sci. Liège 5-6, 249 (2002).
Dupret, M. A., Scuflaire, R., Noels, A., Thoul, A., Garrido, R., Moya, A., De Ridder, J., De Cat, P., Aerts, C.: Astrophys. Space Sci. 284, 129 (2003).
Dziemblowski, W.: Acta Astron. 27, 95 (1977).
Grigahcène, A., Dupret, M. A., Gabriel, M., Garrido, R., Scuflaire, R.: Astron. Astrophys. 434, 1055 (2005).
Lochard, J., Samadi, R., Goupil, M. J.: Astron. Astrophys. 438, 939 (2005).
Meakin, C. A., Arnett, D.: Astrophys. J. 667, 448 (2007).
Michel, E., Samadi, R., Baudin, F., Barban, C., Appourchaux, T., Auvergne, M.: Astron. Astrophys. 495, 979 (2009).
Musielak, Z. E., Rosner, R., Stein, R. F., Ulmschneider, P.: Astrophys. J. 423, 474 (1994).
Pesnell, W. D.: Astrophys. J. 363, 227 (1990).
Samadi, R.: In: Rozelot, J. P., Neiner, C. (eds.) Lecture Notes in Physics. Springer, Berlin (2010, in press).
Samadi, R., Goupil, M.: Astron. Astrophys. 370, 136 (2001) (SG01).
Samadi, R., Nordlund, Å., Stein, R. F., Goupil, M. J., Roxburgh, I.: Astron. Astrophys. 404, 1129 (2003).
Samadi, R., Nordlund, Å., Stein, R. F., Goupil, M. J., Roxburgh, I.: Astron. Astrophys. 403, 303 (2003).
Samadi, R., Belkacem, K., Goupil, M. J., Dupret, M. A., Kupka, F.: Astron. Astrophys. 489, 291 (2008).
Scuflaire, R., Théado, S., Montalbán, J., Miglio, A., Bourge, P. O., Godart, M., Thoul, A., Noels, A.: Astrophys. Space Sci. 316, 83 (2008).
Scuflaire, R., Montalbán, J., Théado, S., Bourge, P. O., Miglio, A., Godart, M., Thoul, A., Noels, A.: Astrophys. Space Sci. 316, 149 (2008).
