Browsing University of Hertfordshire by Author "Georgy, C."

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    • 3D simulations of a neon burning convective shell in a massive star 

      Georgy, C.; Rizzuti, F.; Hirschi, R.; Varma, V.; Arnett, W. D.; Meakin, C.; Mocak, M.; Murphy, A. St J.; Rauscher, T. (2024-07-01)
      The treatment of convection remains a major weakness in the modelling of stellar evolution with one-dimensional (1D) codes. The ever-increasing computing power makes now possible to simulate in three-dimensional (3D) part ...

    • Boron depletion in 9 to 15 M(circle dot) stars with rotation 

      Frischknecht, U.; Hirschi, R.; Meynet, G.; Ekstroem, S.; Georgy, C.; Rauscher, T.; Winteler, C.; Thielemann, F-K. (Cambridge University Press, 2010)
      The treatment of mixing is still one of the major uncertainties in stellar evolution models. One open question is how well the prescriptions for rotational mixing describe the real effects. We tested the mixing prescriptions ...

    • Constraints on rotational mixing from surface evolution of light elements in massive stars 

      Frischknecht, U.; Hirschi, R.; Meynet, G.; Ekstroem, S.; Georgy, C.; Rauscher, T.; Winteler, C.; Thielemann, Friedrich-Karl (2010-11)
      Context. Light elements and nitrogen surface abundances together can constrain the mixing efficiencies in massive stars on the main sequence, because moderate mixing in the surface layers leads to depletion of light elements ...

    • Shell mergers in the late stages of massive star evolution: new insight from 3D hydrodynamic simulations 

      Rizzuti, F.; Hirschi, R.; Varma, V.; Arnett, W. D.; Georgy, C.; Meakin, C.; Mocák, M.; St. Murphy, A. J.; Rauscher, T. (2024-07-23)
      One-dimensional (1D) stellar evolution models are widely used across various astrophysical fields, however they are still dominated by important uncertainties that deeply affect their predictive power. Among those, the ...