Results 21 to 30 of about 24,208 (239)

Phosphorus-rich stars with unusual abundances are challenging theoretical predictions [PDF]

Nature Communications, 2020
Current models of Galactic chemical evolution under predict the phosphorus we observe in our Solar System. Here, the authors show the discovery of 15 phosphorus-rich stars with a peculiar abundance pattern that challenges the present stellar ...
Thomas Masseron, D. A. García-Hernández, Raúl Santoveña, Arturo Manchado, Olga Zamora, Minia Manteiga, Carlos Dafonte   +6 more
doaj   +2 more sources

Stellar abundances and nucleosynthesis

, 2016
Stellar abundances are essential parameters for many branches of astronomy. They are also particularly important as tests for theories of nucleosynthesis. Despite the encouraging results from band photometry, detailed spectroscopic analyses are still important in furthering knowledge of physical processes occurring in a variety of stellar objects. This
Ellis, R, Ellis, Richard S.
openaire   +3 more sources

Turbulence and nuclear reactions in 3D hydrodynamics simulations of massive stars [PDF]

EPJ Web of Conferences, 2023
Our knowledge of massive star evolution and nucleosynthesis is limited by uncertainties related to multi-dimensional processes taking place in stellar interiors.
Rizzuti Federico, Hirschi Raphael, Georgy Cyril, Arnett David, Meakin Casey, Murphy Alexander   +5 more
doaj   +1 more source

The impact of n_TOF data on s-process modelling [PDF]

EPJ Web of Conferences, 2023
We show examples of the impact of the Maxwellian averaged capture cross sections determined at n_TOF over the past 20 years on AGB stellar nucleosynthesis models.
Lanzi Samuele, Cristallo Sergio, Giacomini Francesco, Massimi Cristian, Mengoni Alberto, Vescovi Diego   +5 more
doaj   +1 more source

Analysis of the impact of the 204Tl neutron capture cross section on the s-process only isotope 204Pb [PDF]

EPJ Web of Conferences, 2022
In the study of the slow (s) process of nucleosynthesis branching nuclei become of particular interest. These nuclei have half-lives of the order of 1-100 years, and in the stellar environment their decay rate can compete with the neutron capture rate ...
Casanovas-Hoste Adrià, Domingo-Pardo César, Guerrero Carlos, Tarifeño-Saldivia Ariel, Calviño Francisco, Lerendegui-Marco Jorge   +5 more
doaj   +1 more source

Insights into AGB Nucleosynthesis Thanks to Spectroscopic Abundance Measurements in Intrinsic and Extrinsic Stars

Universe, 2022
The foundations of stellar nucleosynthesis have been established more than 70 years ago. Since then, much progress has been made, both on the theoretical side, with stellar evolution and nucleosynthesis models of increasing complexity, using more and ...
Sophie Van Eck, Shreeya Shetye, Lionel Siess   +2 more
doaj   +1 more source

Impact of AGB Stars on the Chemical Evolution of Neutron-Capture Elements

Universe, 2022
In this review, we discuss the impact of s-process nucleosynthesis in asymptotic giant branch stars on the enrichment of heavy elements. We review the main steps made on this subject in the last 40 years and discuss the importance of modelling the ...
Gabriele Cescutti, Francesca Matteucci
doaj   +1 more source

Underground measurement at LUNA found no evidence for a low-energy resonance in the 6Li(p, γ)7Be reaction [PDF]

EPJ Web of Conferences, 2022
The 6Li(p,γ)7Be reaction is involved in all three main nucleosynthesis scenarios: Big Bang Nucleosynthesis, the interaction of cosmic rays with interstellar matter, and stellar nucleosynthesis.
Piatti Denise
doaj   +1 more source

Quantifying the uncertainties of chemical evolution studies. II. Stellar yields [PDF]

, 2010
This is the second paper of a series which aims at quantifying the uncertainties in chemical evolution model predictions related to the underlying model assumptions.
A. I. Karakas, Akerman, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Arnett, Asplund, Asplund, Bahcall, Baumüller, Baumüller, Bensby, Bensby, Bensby, Bergemann, Bergemann, Bihain, Bonifacio, Boothroyd, Caffau, Carigi, Carigi, Casagrande, Cayrel, Cescutti, Cescutti, Chiappini, Chiappini, Chiappini, Chiappini, Chieffi, Chiosi, D. Romano, de Jager, Decressin, Dray, Dray, Edmunds, Edvardsson, Ekström, F. Matteucci, Fabbian, Feltzing, François, Fröhlich, Gehren, Giovagnoli, Girardi, Goswami, Gratton, Grevesse, Groenewegen, Hauschildt, Henry, Hirschi, Hirschi, Hoffmeister, Honda, Iben, Israelian, Ivanova, Iwamoto, Iwamoto, Izzard, Karakas, Karakas, Karakas, Karakas, Kobayashi, Kovtyukh, Kroupa, Kudritzki, Lai, Limongi, Luck, Luck, M. Tosi, Maeder, Marcolini, Marigo, Marigo, Mashonkina, Matteucci, Matteucci, Matteucci, Matteucci, McWilliam, Meynet, Meynet, Mishenina, Nakamura, Nissen, Nissen, Nissen, Nomoto, Ohkubo, Portinari, Pumo, Ramírez, Reddy, Reddy, Reimers, Renzini, Romano, Romano, Romano, Romano, Russell, Scalo, Schaller, Shi, Shi, Siess, Spite, Straniero, Takeda, Timmes, Tinsley, Tinsley, Tosi, Umeda, Umeda, van den Hoek, Vassiliadis, Ventura, Ventura, Wallerstein, Woosley, Yoshida, Zhang   +133 more
core   +1 more source

Low Mass Stars or Intermediate Mass Stars? The Stellar Origin of Presolar Oxide Grains Revealed by Their Isotopic Composition

Frontiers in Astronomy and Space Sciences, 2021
Among presolar grains, oxide ones are made of oxygen, aluminum, and a small fraction of magnesium, produced by the 26Al decay. The largest part of presolar oxide grains belong to the so-called group 1 and 2, which have been suggested to form in Red Giant
S. Palmerini, S. Palmerini, S. Cristallo, S. Cristallo, M. Busso, M. Busso, M. La Cognata, M. L. Sergi, M. L. Sergi, D. Vescovi, D. Vescovi, D. Vescovi   +11 more
doaj   +1 more source