All Outputs (11)

Relative Importance of Convective Uncertainties (2019)
Conference Proceeding
Kaiser, E. A., Hirschi, R., Arnett, W. D., Cristini, A., Georgy, C., & Scott, L. J. A. (2019). Relative Importance of Convective Uncertainties. . https://doi.org/10.1007/978-3-030-13876-9_71

Convection plays a key role in the evolution of stars due to energy transport and mixing of composition. Despite its importance, this process is still not well understood. One longstanding conundrum in all 1D stellar evolution codes is the treatment... Read More about Relative Importance of Convective Uncertainties.

Impact of rotation and magnetic fields in low mass AGB stars (2018)
Conference Proceeding
den Hartogh, J. W., Hirschi, R., Georgy, C., Eggenberger, P., Herwig, F., Pignatari, M., …Ritter, C. (2018). Impact of rotation and magnetic fields in low mass AGB stars. . https://doi.org/10.1088/1742-6596/940/1/012038

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... Read More about Impact of rotation and magnetic fields in low mass AGB stars.

The First 3D Simulations of Carbon Burning in a Massive Star (2016)
Conference Proceeding
Cristini, A., Meakin, C., Hirschi, R., Arnett, D., Georgy, C., & Viallet, M. (2016). The First 3D Simulations of Carbon Burning in a Massive Star. . https://doi.org/10.1017/s1743921317003441

We present the first detailed three-dimensional hydrodynamic implicit large eddy simulations of turbulent convection for carbon burning. The simulations start with an initial radial profile mapped from a carbon burning shell within a 15 M⊙ stellar ev... Read More about The First 3D Simulations of Carbon Burning in a Massive Star.

Wolf-Rayet stars as an evolved stage of stellar life (2016)
Conference Proceeding
Georgy, C., Ekström, S., Hirschi, R., Meynet, G., Groh, J., & Eggenberger, P. (2016). Wolf-Rayet stars as an evolved stage of stellar life. In Wolf-Rayet Stars: Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015

Wolf-Rayet (WR) stars, as they are advanced stages of the life of massive stars, provide a good test for various physical processes involved in the modelling of massive stars, such as rotation and mass loss. In this paper, we show the outputs of the... Read More about Wolf-Rayet stars as an evolved stage of stellar life.

The Chemical Evolution of Heavy Elements in Globular Clusters (2013)
Conference Proceeding
Shingles, L. J., Karakas, A. I., & Hirschi, R. (2013). The Chemical Evolution of Heavy Elements in Globular Clusters. . https://doi.org/10.1017/s1743921313007059

We present preliminary results from a chemical evolution model that tracks the composition of heavy elements beyond iron in a globular cluster. The heavy elements can be used as tracers of the nucleosynthetic events that defined the formation and evo... Read More about The Chemical Evolution of Heavy Elements in Globular Clusters.

The impact of reduced mass loss rates on the evolution of massive stars (2008)
Conference Proceeding
Hirschi, R. (2008). The impact of reduced mass loss rates on the evolution of massive stars.

Mass loss is a very important aspect of the life of massive stars. After briefly reviewing its importance, we discuss the impact of the recently proposed downward revision of mass loss rates due to clumping (difficulty to form Wolf-Rayet stars and pr... Read More about The impact of reduced mass loss rates on the evolution of massive stars.

Developments in physics of massive stars (2007)
Conference Proceeding
Meynet, G., Ekström, S., Maeder, A., Hirschi, R., Georgy, C., & Beffa, C. (2007). Developments in physics of massive stars. . https://doi.org/10.1017/S1743921308020449

New constraints on stellar models are provided by large surveys of massive stars, interferometric observations and asteroseismology. After a review of the main results so far obtained, we present new results from rotating models and discuss compariso... Read More about Developments in physics of massive stars.

Rotating massive stars @ very low Z: high C and N production (2006)
Conference Proceeding
Hirschi, R. (2006). Rotating massive stars @ very low Z: high C and N production. . https://doi.org/10.1063/1.2234385

Two series of models and their yields are presented in this paper. The first series consists of 20 Mo models with varying initial metallicity (solar down to $Z=10^{-8}$) and rotation (Vini=0-600 km/s). The second one consists of models with an initia... Read More about Rotating massive stars @ very low Z: high C and N production.

Pre-suprenova evolution of rotating massive stars (2005)
Conference Proceeding
Hirschi, R., Meynet, G., Maeder, A., & Goriely, S. (2005). Pre-suprenova evolution of rotating massive stars. . https://doi.org/10.1007/3-540-26633-X_28

The Geneva evolutionary code has been modified to study the advanced stages (Ne, O, Si burnings) of rotating massive stars. Here we present the results of four 20 solar mass stars at solar metallicity with initial rotational velocities of 0, 100, 200... Read More about Pre-suprenova evolution of rotating massive stars.

Evolution and Nucleosynthesis of Massive Stars
Conference Proceeding
Meynet, G., Maeder, A., Choplin, A., Takahashi, K., Ekström, S., Hirschi, R., …Eggenberger, P. (2017). Evolution and Nucleosynthesis of Massive Stars. . https://doi.org/10.7566/jpscp.14.010401

Massive stars are rapid nuclear reactors that play a key role in injecting new synthesized elements in the interstellar medium. Depending on the strengths of the stellar winds on the efficiency of mixing processes, the masses and the chemical composi... Read More about Evolution and Nucleosynthesis of Massive Stars.

Production Uncertainties of p-Nuclei in the γ-Process in Massive Stars Using a Monte Carlo Approach
Conference Proceeding
Rauscher, T., Nishimura, N., Hirschi, R., Cescutti, G., Murphy, A. S. J., & Heger, A. (2017). Production Uncertainties of p-Nuclei in the γ-Process in Massive Stars Using a Monte Carlo Approach. In Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016). https://doi.org/10.7566/jpscp.14.010509

Proton-rich nuclei, the so-called p-nuclei, are made in photodisintegration processes in outer shells of massive stars in the course of the final supernova explosion. Nuclear uncertainties in the production of these nuclei have been quantified in a M... Read More about Production Uncertainties of p-Nuclei in the γ-Process in Massive Stars Using a Monte Carlo Approach.