Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-12T22:28:14.006Z Has data issue: false hasContentIssue false
  • English
  • Français

Radiative hydrodynamic simulations of turbulent convection and pulsations of Kepler target stars

Published online by Cambridge University Press:  18 February 2014

Irina N. Kitiashvili
Irina N. Kitiashvili*
Affiliation:
Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA email: [email protected] Center for Turbulence Research, Stanford University, Stanford, CA 94305, USA Kazan Federal University, Kazan, 420008, Russia
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The problem of interaction of stellar pulsations with turbulence and radiation in stellar convective envelopes is central to our understanding of excitation mechanisms, oscillation amplitudes and frequency shifts. Realistic (“ab initio”) numerical simulations provide unique insights into the complex physics of pulsation-turbulence-radiation interactions, as well as into the energy transport and dynamics of convection zones, beyond the standard evolutionary theory. 3D radiative hydrodynamics simulations have been performed for several Kepler target stars, from M- to A-class along the main sequence, using a new ‘StellarBox’ code, which takes into account all essential physics and includes subgrid scale turbulence modeling. The results reveal dramatic changes in the convection and pulsation properties among stars of different mass. For relatively massive stars with thin convective envelopes, the simulations allow us to investigate the dynamics the whole envelope convection zone including the overshoot region, and also look at the excitation of internal gravity waves. Physical properties of the turbulent convection and pulsations, and the oscillation spectrum for two of these targets are presented and discussed in this paper. In one of these stars, with mass 1.47 M⊙, we simulate the whole convective zone and investigate the overshoot region at the boundary with the radiative zone.

Keywords

stars: Hertzsprung-Russell diagramoscillationsconvectionplasmasturbulencemethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 193 - 196
Copyright
Copyright © International Astronomical Union 2014 

References

Benomar, O., Baudin, F., Chaplin, W. J., et al. 2012a, MNRAS, 420, 2178Google Scholar
Benomar, O., Bedding, T. R., Stello, D., et al. 2012b, ApJ, 745, L33Google Scholar
Bonaca, A., Tanner, J. D., Basu, S., et al. 2012, ApJ, 755, L12Google Scholar
Chaplin, W. J., Kjeldsen, H., Bedding, T. R., et al. 2011, ApJ, 732, 54Google Scholar
Guzik, J. A. 2011, Ap&SS, 336, 95Google Scholar
Guzik, J. A. & Mussack, K. 2010, ApJ, 713, 1108Google Scholar
Jacoutot, L., Kosovichev, A. G., Wray, A. A., & Mansour, N. N. 2008a, ApJ, 684, L51CrossRefGoogle Scholar
Jacoutot, L., Kosovichev, A. G., Wray, A. A., & Mansour, N. N. 2008b, ApJ, 682, 1386Google Scholar
Kitiashvili, I. N., Bellot Rubio, L. R., Kosovichev, A. G., et al. 2010, ApJ, 716, L181Google Scholar
Kitiashvili, I. N., Kosovichev, A. G., Mansour, N. N., & Wray, A. A. 2011a, ApJ, 727, L50Google Scholar
Kitiashvili, I. N., Kosovichev, A. G., Mansour, N. N., & Wray, A. A. 2011b, Solar Phys., 268, 283Google Scholar
Kitiashvili, I. N., Abramenko, V. I., Goode, P. R., et al. 2013, Physica Scripta, 155, 014025Google Scholar
Kjeldsen, H., Bedding, T. R., & Christensen-Dalsgaard, J. 2008, ApJ, 683, L175Google Scholar
Lefebvre, S., Kosovichev, A. G., & Rozelot, J. P. 2006, in: Barret, D., Casoli, F., Lagache, G., Lecavelier, A., & Pagani, L. (eds.), SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, p. 551Google Scholar
Morel, P. 1997, A&AS, 124, 597Google Scholar
Morel, P. & Lebreton, Y. 2008, Ap&SS, 316, 61Google Scholar
Uytterhoeven, K., Moya, A., Grigahcène, A., et al. 2011, A&A, 534, A125Google Scholar
Verner, G. A., Chaplin, W. J., Basu, S., et al. 2011, ApJ, 738, L28Google Scholar