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Abstract
After core helium burning in low and intermediate-mass stars, starts the AGB phase. In this phase, the s process takes place, which is believed to be at the origin of half of all elements heavier than iron. The role of rotation and magnetic fields on the AGB phase is still debated and uncertain. We have calculated stellar evolution models with MESA for stars with an initial mass of 1.5 and 3.0 solar masses. Our models include both rotation and the Taylor-Spruit (TS) dynamo. We show how these physical processes contribute to the total diffusion coefficient and how it will effect the transport of angular momentum and the s-process nucleosynthesis.
Our preliminary results confirm previous results that inclusion of rotation and the TS dynamo, compared to inclusion of rotation alone, results in an improvement of the predicted rotational period of white dwarfs. Inclusion of the TS dynamo reduces the rotationally induced mixing. The impact on the s-process nucleosynthesis is underway and will be presented in a forthcoming publication.
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Details
1 Astrophysics Group, Lennard Jones Building, Keele University, Staffordshire ST5 5BG, UK; NuGrid collaboration, http://www.nugridstars.org
2 Astrophysics Group, Lennard Jones Building, Keele University, Staffordshire ST5 5BG, UK; Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, Kashiwa, Chiba 277-8583, Japan; NuGrid collaboration, http://www.nugridstars.org
3 Astrophysics Group, Lennard Jones Building, Keele University, Staffordshire ST5 5BG, UK; Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290 Versoix, Switzerland
4 Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290 Versoix, Switzerland
5 Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 3P6, Canada; Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, IN 46556, USA; NuGrid collaboration, http://www.nugridstars.org
6 Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary; NuGrid collaboration, http://www.nugridstars.org
7 Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland; NuGrid collaboration, http://www.nugridstars.org
8 Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 3P6, Canada