99 citations · 885 across the 42 of their papers we have counts for
18 papers · 1 filter
Observational Signatures and Constraints on the Intermediate Neutron-Capture Process. The Case of the CEMP star TYC 6044-714-1 (RAVE J094921.8-161722)
Riano E. Giribaldi, Diego Vescovi, Laura Magrini +6
Observational abundances of CEMP stars with patterns in between those produced by the rapid and slow nucleosynthesis processes (CEMP-rs stars) are currently invoked as evidence of…
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…
Impact of newly measured 26Al(n, p)26Mg and 26Al(n, α)23Na reaction rates on the nucleosynthesis of 26Al in stars
Umberto Battino, Claudia Lederer-Woods, Marco Pignatari +6
The cosmic production of the short-lived radioactive nuclide 26Al is crucial for our understanding of the evolution of stars and galaxies. However, simulations of the stellar sites…
s-process Enriched Post-AGB Star J003643.94-723722.1 in the SMC with an Extreme C/O Ratio and the First Precise Detection of Lead
Meghna Menon, Devika Kamath, Maksym Mohorian +6
Post-asymptotic giant branch (post-AGB) stars are exquisite tracers of s-process nucleosynthesis via their surface abundances. We present a comprehensive analysis of J003643.947…
Presolar Silicon Carbide Grains of Types Y and Z: Their Strontium and Barium Isotopic Compositions and Stellar Origins
Nan Liu, Thomas Stephan, Sergio Cristallo +5
We report the Sr and Ba isotopic compositions of 18 presolar SiC grains of types Y (11) and Z (7), rare types commonly argued to have formed in lower-than-solar metallicity asympto…
Slow Neutron-Capture Process: Low-mass AGB stars and presolar silicon carbide grains
Nan Liu, Sergio Cristallo, Diego Vescovi
Presolar grains are microscopic dust grains that formed in the stellar winds or explosions of ancient stars that died before the formation of the solar system. The majority (~90% i…
Theoretical estimate of the half-life for the radioactive Cs and Cs in astrophysical scenarios
S. Taioli, D. Vescovi, M. Busso +4
We analyze the CsBa and CsBa decays, which are crucial production channels for Ba isotopes in Asympt…
Presolar grain isotopic ratios as constraints to nuclear and stellar parameters of AGB nucleosynthesis
Sara Palmerini, Maurizio Busso, Diego Vescovi +8
Recent models for evolved Low Mass Stars (with ), undergoing the AGB phase assume that magnetic flux-tube buoyancy drives the formation of C reservoirs…
Magnetic-buoyancy-induced mixing in AGB Stars: fluorine nucleosynthesis at different metallicities
D. Vescovi, S. Cristallo, S. Palmerini +2
Asymptotic giant branch (AGB) stars are considered to be among the most significant contributors to the fluorine budget in our Galaxy. While at close-to-solar metallicity observati…
s-Processing in AGB Stars Revisited. III. Neutron captures from MHD mixing at different metallicities and observational constraints
Maurizio Busso, Diego Vescovi, Sara Palmerini +2
We present post process neutron capture computations for Asymptotic Giant Branch stars of 1.5 to 3 Mo and metallicities -1.3 to 0.1. The reference stellar models are computed with…
On the mass and metallicity distribution of parent AGB stars of presolar SiC
Sergio Cristallo, Ambra Nanni, Gabriele Cescutti +5
The vast majority (>=90%) of presolar SiC grains identified in primitive meteorites are relics of ancient asymptotic giant branch (AGB) stars, whose ejecta were incorporated into t…
The luminosity constraint in the era of precision solar physics
Diego Vescovi, Carlo Mascaretti, Francesco Vissani +2
The luminosity constraint is a very precise relationship linking the power released by the Sun as photons and the solar neutrino fluxes. Such a relation, which is a direct conseque…
Magnetic-buoyancy Induced Mixing in AGB Stars: Presolar SiC Grains
Diego Vescovi, Sergio Cristallo, Maurizio Busso +1
Isotope ratios can be measured in presolar SiC grains from ancient Asymptotic Giant Branch (AGB) stars at permil-level (0.1\%) precision. Such precise grain data permit derivation…
Modeling the formation of the C neutron source in AGB stars
Diego Vescovi, Sergio Cristallo
A major source of uncertainty in AGB models is the partial-mixing process of hydrogen, required for the formation of the so-called C pocket. Among the attempts to derive a s…
The effects of a revised Be e-capture rate on solar neutrino fluxes
D. Vescovi, L. Piersanti, S. Cristallo +5
The electron-capture rate on Be is the main production channel for Li in several astrophysical environments. Theoretical evaluations have to account for not only the nuclea…
On the Origin of the Early Solar System Radioactivities. Problems with the AGB and Massive Star Scenarios
D. Vescovi, M. Busso, S. Palmerini +7
Recent improvements in stellar models for intermediate-mass and massive stars are recalled, together with their expectations for the synthesis of radioactive nuclei of lifetime $τ\…
The importance of the 13C(alpha,n)16O reaction in Asymptotic Giant Branch stars
S. Cristallo, M. La Cognata, C. Massimi +9
Low mass Asymptotic Giant Branch stars are among the most important polluters of the interstellar medium. In their interiors, the main component (A>90) of the slow neutron capture…
s-Processing from MHD-induced mixing and isotopic abundances in presolar SiC grains
S. Palmerini, O. Trippella, M. Busso +4
In the past years the observational evidence that s-process elements from Sr to Pb are produced by stars ascending the socalled Asymptotic Giant Branch (or AGB) could not be explai…