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s-process production in rotating massive stars at solar and low metallicities (2015)
Journal Article
Frischknecht, U., Hirschi, R., Pignatari, M., Maeder, A., Meynet, G., Chiappini, C., …Ekström, S. (2016). s-process production in rotating massive stars at solar and low metallicities. Monthly Notices of the Royal Astronomical Society, 456(2), 1803 - 1825. https://doi.org/10.1093/mnras/stv2723

Rotation was shown to have a strong impact on the structure and light element nucleosynthesis in massive stars. In particular, models including rotation can reproduce the primary nitrogen observed in halo extremely metal poor (EMP) stars. Additional... Read More about s-process production in rotating massive stars at solar and low metallicities.

Clues on the first stars from CEMP-no stars (2015)
Journal Article
Choplin, A., Meynet, G., Maeder, A., Hirschi, R., Ekström, S., & Chiappini, C. (2015). Clues on the first stars from CEMP-no stars. Proceedings of the International Astronomical Union, 11(S317), 282-283. https://doi.org/10.1017/s1743921315006808

The material used to form the CEMP-no stars presents signatures of processing by the CNO cycle and by He-burning from a previous stellar generation called spinstars. We compare the composition of the ejecta (wind + supernova) of a spinstar model to o... Read More about Clues on the first stars from CEMP-no stars.

The role of neutron star mergers in the chemical evolution of the Galactic halo (2015)
Journal Article
Hirschi. (2015). The role of neutron star mergers in the chemical evolution of the Galactic halo. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201525698

Context. The dominant astrophysical production site of the r-process elements has not yet been unambiguously identified. The suggested main r-process sites are core-collapse supernovae and merging neutron stars. Aims. We explore the problem of the... Read More about The role of neutron star mergers in the chemical evolution of the Galactic halo.

Linking 1D Stellar Evolution to 3D Hydrodynamical Simulations (2015)
Journal Article
Hirschi, R. (2015). Linking 1D Stellar Evolution to 3D Hydrodynamical Simulations. Proceedings of the International Astronomical Union, 98-99. https://doi.org/10.1017/S1743921314006371

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 gene... Read More about Linking 1D Stellar Evolution to 3D Hydrodynamical Simulations.

Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: Evolution to the end of core helium burning (2015)
Journal Article
Jones, S., Hirschi, R., Pignatari, M., Heger, A., Georgy, C., Nishimura, N., …Herwig, F. (2015). Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: Evolution to the end of core helium burning. Monthly Notices of the Royal Astronomical Society, 447(4), 3115-3129. https://doi.org/10.1093/mnras/stu2657

Massive stars are key sources of radiative, kinetic, and chemical feedback in the universe. Grids of massive star models computed by different groups each using their own codes, input physics choices and numerical approximations, however, lead to inc... Read More about Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: Evolution to the end of core helium burning.