Outputs (123)

Very massive star winds as sources of the short-lived radioactive isotope 26Al (2022)
Journal Article
Martinet, S., Meynet, G., Nandal, D., Ekström, S., Georgy, C., Haemmerlé, L., …Dwarkadas, V. (2022). Very massive star winds as sources of the short-lived radioactive isotope 26Al. Astronomy & Astrophysics, 664, A181. https://doi.org/10.1051/0004-6361/202243474

Context. The 26Al short-lived radioactive nuclide is the source of the observed galactic diffuse γ-ray emission at 1.8 MeV. While different sources of 26Al have been explored, such as asymptotic giant branch stars, massive stellar winds, and supernov... Read More about Very massive star winds as sources of the short-lived radioactive isotope 26Al.

Realistic 3D hydrodynamics simulations find significant turbulent entrainment in massive stars (2022)
Journal Article
Rizzuti, F., Hirschi, R., Georgy, C., Arnett, W. D., Meakin, C., & Murphy, A. S. (2022). Realistic 3D hydrodynamics simulations find significant turbulent entrainment in massive stars. Monthly Notices of the Royal Astronomical Society, 515(3), 4013-4019. https://doi.org/10.1093/mnras/stac1981

Our understanding of stellar structure and evolution coming from one-dimensional (1D) stellar models is limited by uncertainties related to multidimensional processes taking place in stellar interiors. 1D models, however, can now be tested and improv... Read More about Realistic 3D hydrodynamics simulations find significant turbulent entrainment in massive stars.

The impact of O-17 + alpha reaction rate uncertainties on the s-process in rotating massive stars (2022)
Journal Article
Frost-Schenk, J., Adsley, P., Laird, A. M., Longland, R., Angus, C., Barton, C., …Setoodehnia, K. (2022). The impact of O-17 + alpha reaction rate uncertainties on the s-process in rotating massive stars. Monthly Notices of the Royal Astronomical Society, 514(2), 2650 - 2657. https://doi.org/10.1093/mnras/stac1373

Massive stars are crucial to galactic chemical evolution for elements heavier than iron. Their contribution at early times in the evolution of the Universe, however, is unclear due to poorly constrained nuclear reaction rates. The competing 17O(a, ?)... Read More about The impact of O-17 + alpha reaction rate uncertainties on the s-process in rotating massive stars.

The p-process in exploding rotating massive stars (2022)
Journal Article
Choplin, A., Goriely, S., Hirschi, R., Tominaga, N., & Meynet, G. (2022). The p-process in exploding rotating massive stars. Astronomy & Astrophysics, 661, Article A86. https://doi.org/10.1051/0004-6361/202243331

Context. The p-process nucleosynthesis can explain proton-rich isotopes that are heavier than iron, which are observed in the Solar System, but discrepancies still persist (e.g. for the Mo and Ru p-isotopes), and some important questions concerning t... Read More about The p-process in exploding rotating massive stars.

Dynamics in a stellar convective layer and at its boundary: Comparison of five 3D hydrodynamics codes (2022)
Journal Article
Andrassy, R., Higl, J., Mao, H., Mocak, M., Vlaykov, D. G., Arnett, W. D., …Woodward, P. (2022). Dynamics in a stellar convective layer and at its boundary: Comparison of five 3D hydrodynamics codes. Astronomy & Astrophysics, 659, Article ARTN A193. https://doi.org/10.1051/0004-6361/202142557

Our ability to predict the structure and evolution of stars is in part limited by complex, 3D hydrodynamic processes such as convective boundary mixing. Hydrodynamic simulations help us understand the dynamics of stellar convection and convective bou... Read More about Dynamics in a stellar convective layer and at its boundary: Comparison of five 3D hydrodynamics codes.

Grids of stellar models with rotation VII: models from 0.8 to 300 M-circle dot at supersolar metallicity (Z=0.020) (2022)
Journal Article
Yusof, N., Hirschi, R., Eggenberger, P., Ekström, S., Georgy, C., Sibony, Y., …Murphy, L. (2022). Grids of stellar models with rotation VII: models from 0.8 to 300 M-circle dot at supersolar metallicity (Z=0.020). Monthly Notices of the Royal Astronomical Society, 511(2), 2814 - 2828. https://doi.org/10.1093/mnras/stac230

We present a grid of stellar models at supersolar metallicity (Z = 0.020) extending the previous grids of Geneva models at solar and sub-solar metallicities. A metallicity of Z = 0.020 was chosen to match that of the inner Galactic disc. A modest inc... Read More about Grids of stellar models with rotation VII: models from 0.8 to 300 M-circle dot at supersolar metallicity (Z=0.020).

UVES analysis of red giants in the bulge globular cluster NGC 6522 (2021)
Journal Article
Hirschi. (2021). UVES analysis of red giants in the bulge globular cluster NGC 6522. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202140815

Context. NGC 6522 is a moderately metal-poor bulge globular cluster ([Fe/H] ~ -1.0), and it is a well-studied representative among a number of moderately metal-poor blue horizontal branch clusters located in the bulge. The NGC 6522 abundance pattern... Read More about UVES analysis of red giants in the bulge globular cluster NGC 6522.

Multidimensional low-Mach number time-implicit hydrodynamic simulations of convective helium shell burning in a massive star (2021)
Journal Article
Hirschi. (2021). Multidimensional low-Mach number time-implicit hydrodynamic simulations of convective helium shell burning in a massive star. Astronomy & Astrophysics, 1-24. https://doi.org/10.1051/0004-6361/202140825

Context. A realistic parametrization of convection and convective boundary mixing in conventional stellar evolution codes is still the subject of ongoing research. To improve the current situation, multidimensional hydrodynamic simulations are used t... Read More about Multidimensional low-Mach number time-implicit hydrodynamic simulations of convective helium shell burning in a massive star.

Grids of stellar models with rotation: VI. Models from 0.8 to 120 M⊙ at a metallicity Z = 0.006 (2021)
Journal Article
Eggenberger, P., Ekström, S., Georgy, C., Martinet, S., Pezzotti, C., Nandal, D., …Choplin, A. (2021). Grids of stellar models with rotation: VI. Models from 0.8 to 120 M⊙ at a metallicity Z = 0.006. Astronomy & Astrophysics, 652, Article A137. https://doi.org/10.1051/0004-6361/202141222

Context. Grids of stellar models, computed with the same physical ingredients, allow one to study the impact of a given physics on a broad range of initial conditions and they are a key ingredient for modeling the evolution of galaxies. Aims. We p... Read More about Grids of stellar models with rotation: VI. Models from 0.8 to 120 M⊙ at a metallicity Z = 0.006.

Grids of stellar models with rotation VI. Models from 0.8 to 120 M-circle dot at a metallicity Z=0.006 (2021)
Journal Article
Hirschi. (2021). Grids of stellar models with rotation VI. Models from 0.8 to 120 M-circle dot at a metallicity Z=0.006. Astronomy & Astrophysics,

Context. Grids of stellar models, computed with the same physical ingredients, allow one to study the impact of a given physics on a broad range of initial conditions and they are a key ingredient for modeling the evolution of galaxies. Aims. We p... Read More about Grids of stellar models with rotation VI. Models from 0.8 to 120 M-circle dot at a metallicity Z=0.006.