It is quite satisfying to tackle old problems with new techniques and finally get answers that we previously thought impossible to get. I will report on our latest generation of simulations of massive main-sequence stars that finally reveal in unprecedented detail and realism the properties of the turbulent flow in the convective core and the topology of the convective boundary that consists of a substantial almost adiabatic penetration layer. Through these simulations we can also understand properties of recently discovered low-frequency power excess in asteroseismic satellite observations of massive stars and we can constrain mixing due to internal gravity waves excited in the stable layers above the convective core.
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2022-11-07T15:00:002022-02-07T16:00:003D Hydrodynamic Simulations of Convection and Internal Gravity Waves in Massive StarsEvent Information:
Abstract:
It is quite satisfying to tackle old problems with new techniques and finally get answers that we previously thought impossible to get. I will report on our latest generation of simulations of massive main-sequence stars that finally reveal in unprecedented detail and realism the properties of the turbulent flow in the convective core and the topology of the convective boundary that consists of a substantial almost adiabatic penetration layer. Through these simulations we can also understand properties of recently discovered low-frequency power excess in asteroseismic satellite observations of massive stars and we can constrain mixing due to internal gravity waves excited in the stable layers above the convective core.
Bio:
Falk Herwig leads the Computational Stellar Astrophysics group to conduct research in a range of topics related to the evolution, hydrodynamics and nuclear astrophysics of stars and stellar explosions of single and binary stars. The CSA group participates in the NSF Physics Frontier Center Joint Institute for Nuclear Astrophysics - Chemical Evolution of the Elements and is an active member of the NuGrid collaboration. The CSA computational research is supported by Compute Canada high-performance computing time allocations on the Niagara supercomputer.
Dr Falk Herwig, Professor
Dept of Physics & Astronomy
University of Victoria
https://www.uvic.ca/research/centres/arc/people/faculty/herwig-falk.phphttps://www.ppmstar.orghttps://canpan.ca
Email: fherwig@uvic.ca
Tel: +1 (250) 721-7743
Twitter: @fherwig
Event Location:
HENN 318
