32 citations · 179 across the 19 of their papers we have counts for
21 papers
Thorium and Europium production in the early Galaxy: Implications for nucleocosmochronology
L. Magrini, R. E. Giribaldi, M. Palla +17
The ages of the oldest stellar populations can be investigated through nucleocosmochronology, with the thorium-to-europium abundance ratio providing a promising chronometer. We ass…
Structure of Convective-Reactive Zone in a Supernova Progenitor
M. Mocak, C. Meakin, F. Rizzuti +5
Convective-reactive events are phases of stellar evolution where turbulent mixing and nuclear burning directly compete, since their timescales become similar within convection zone…
3D simulations of a complete convective silicon shell burning phase
V. Varma, R. Hirschi, F. Rizzuti +7
We present 3D hydrodynamic simulations of a complete silicon shell burning phase until fuel exhaustion at the end of the evolution of a 14 core-collapse supernova progenit…
HRMOS: A High-Resolution Multi-Object Spectrograph for the VLT
Laura Magrini, Thomas Bensby, Sofia Randich +174
This White Paper presents the scientific rationale and instrument concept for HRMOS (High-Resolution Multi-Object Spectrograph), a next-generation instrument proposed for the ESO V…
The nucleosynthesis of Ba in the Early Universe. Constraints from elemental abundances and isotopic ratios
Riano E. Giribaldi, Marco Palla, Laura Magrini +6
The [Ba/Eu] abundance ratio is commonly adopted as a tracer of the relative contributions of the slow (s) and rapid (r) neutron-capture processes. However, at [Fe/H] < -2 dex, Ba c…
Phlegethon: a fully compressible magnetohydrodynamic code for simulations in stellar astrophysics
G. Leidi, A. Holas, K. Vitovsky +12
We present PHLEGETHON, a fully compressible, Eulerian magnetohydrodynamic (MHD) code designed for multidimensional simulations in stellar astrophysics. The code uses a time-explici…
The Impact of Initial Mass Dependent Convective Boundary Mixing on the Structure and Fates of Massive Stars
Emily E. Whitehead, Raphael Hirschi, Vishnu Varma +4
While convection has been known to play a key role in stars for many decades, its implementation in one-dimensional stellar evolution codes still represents a major uncertainty tod…
Fluorine Evolution in the Galactic Halo
Valeria Grisoni, Federico Rizzuti, Gabriele Cescutti
The chemical evolution of fluorine is still a matter of debate in Galactic archaeology, especially at low metallicities, where it is particularly challenging to obtain the correspo…
Lithium evolution in the Galactic thin disc from Main-Sequence and early Red-Giant-Branch stars
C. T. Nguyen, G. Cescutti, F. Matteucci +7
The role of novae as producers of galactic lithium has been suggested since the 1970s, and it has been reconsidered recently with the detection of Be in their outbursts. At the…
Unlocking the mystery of Sr synthesis in the early Galaxy through analysis of barium isotopes in very metal-poor stars
T. M. Sitnova, L. Lombardo, L. I. Mashonkina +8
We determine the contributions of the rapid (r) and slow (s) neutron capture processes to the Ba isotope mixture, along with Ba, Eu, and Sr NLTE abundances, in a sample of very met…
Neutron-Capture Element Signatures in Globular Clusters: Insights from the Gaia-ESO Survey
J. Schiappacasse-Ulloa, L. Magrini, S. Lucatello +8
Globular clusters (GCs) are key to understanding the formation and evolution of our Galaxy. While the abundances of light and Fe-peak elements in GCs have been widely studied, inve…
Explaining the ratio in the Galactic halo: the contribution from shell mergers in primordial massive stars
F. Rizzuti, G. Cescutti, P. Molaro +5
Recent campaigns of observations have provided new measurements of the carbon isotopes in the most metal-poor stars of the Galaxy. These stars are so metal-poor that they could onl…
Chemical Evolution of R-process Elements in Stars (CERES). III. Chemical abundances of neutron capture elements from Ba to Eu
L. Lombardo, C. J. Hansen, F. Rizzuti +11
The chemical abundances of elements such as barium and the lanthanides are essential to understand the nucleosynthesis of heavy elements in the early Universe as well as the contri…
High N/O ratio at high redshift as a result of a strong burst of star formation and differential galactic winds
F. Rizzuti, F. Matteucci, P. Molaro +2
Recent observations by JWST have revealed supersolar N abundances in galaxies at very high redshift. On the other hand, these galaxies show subsolar metallicity. The observe…
Shell mergers in the late stages of massive star evolution: new insight from 3D hydrodynamic simulations
Federico Rizzuti, Raphael Hirschi, Vishnu Varma +6
One-dimensional (1D) stellar evolution models are widely used across various astrophysical fields, however they are still dominated by important uncertainties that deeply affect th…
3D simulations of convective shell Neon-burning in a massive star
C. Georgy, F. Rizzuti, R. Hirschi +6
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 t…
3D stellar evolution: hydrodynamic simulations of a complete burning phase in a massive star
F. Rizzuti, R. Hirschi, W. D. Arnett +5
Our knowledge of stellar evolution is driven by one-dimensional (1D) simulations. 1D models, however, are severely limited by uncertainties on the exact behaviour of many multi-dim…
Realistic 3D hydrodynamics simulations find significant turbulent entrainment in massive stars
F. Rizzuti, R. Hirschi, C. Georgy +3
Our understanding of stellar structure and evolution coming from one-dimensional (1D) stellar models is limited by uncertainties related to multi-dimensional processes taking place…
Dynamics in a stellar convective layer and at its boundary: Comparison of five 3D hydrodynamics codes
R. Andrassy, J. Higl, H. Mao +18
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 he…
Constraints on stellar rotation from the evolution of Sr and Ba in the Galactic halo
F. Rizzuti, G. Cescutti, F. Matteucci +4
Recent studies show that the chemical evolution of Sr and Ba in the Galaxy can be explained if different production sites, hosting r- and s-processes, are taken into account. Howev…
The contribution from rotating massive stars to the enrichment in Sr and Ba of the Milky Way
Federico Rizzuti, Gabriele Cescutti, Francesca Matteucci +3
Most neutron capture elements have a double production by r- and s-processes, but the question of production sites is complex and still open. Recent studies show that including ste…