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Cristini, Andrea; Hirschi, Raphael; Georgy, Cyril; Meakin, Casey; Arnett, David; Viallet, Maxime (2014)
Publisher: Cambridge University Press
Languages: English
Types: Article
Subjects: Astrophysics - Solar and Stellar Astrophysics, QB

Classified by OpenAIRE into

arxiv: Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics
In this contribution we present initial results of a study on convective boundary mixing (CBM) in massive stellar models using the GENEVA stellar evolution code. Before undertaking costly 3D hydrodynamic simulations, it is important to study the general properties of convective boundaries, such as the: composition jump; pressure gradient; and `stiffness'. Models for a 15Mo star were computed. We found that for convective shells above the core, the lower (in radius or mass) boundaries are `stiffer' according to the bulk Richardson number than the relative upper (Schwarzschild) boundaries. Thus, we expect reduced CBM at the lower boundaries in comparison to the upper. This has implications on flame front propagation and the onset of novae.
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    • Denissenkov, P. A., Herwig, F., Bildsten, L., & Paxton, B. 2013a, ApJ 762, 8 Denissenkov, P. A., Herwig, F., Truran, J. W., & Paxton, B. 2013b, ApJ 772, 37 Eggenberger, P., Meynet, G., Maeder, A., et al. 2008, Ap&SS 316, 43 Jones, S., Hirschi, R., Nomoto, K., et al. 2013, ApJ 772, 150 Kippenhahn, R., Weigert, A., & Weiss, A. 2013, Stellar Structure and Evolution Meakin, C. A. & Arnett, D. 2007, ApJ 667, 448
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