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Abundances of neutron-capture elements in stars of the Galactic disk substructures
Aims. The aim of this work is to present and discuss the observations of the iron peak (Fe, Ni) and neutron-capture element (Y, Zr, Ba, La, Ce, Nd, Sm, and Eu) abundances for 276 FGK dwarfs, located…
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THE WEAK s-PROCESS IN MASSIVE STARS AND ITS DEPENDENCE ON THE NEUTRON CAPTURE CROSS SECTIONS
The slow neutron capture process in massive stars (weak s process) produces most of the s-process isotopes between iron and strontium. Neutrons are provided by the 22Ne(α,n)25Mg reaction, which is…
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s-process production in rotating massive stars at solar and low metallicities
This article has been accepted for publication by Monthly Notices of the Royal Astronomical Society. © The Authors. Published by the Oxford University Press on behalf of the Royal Astronomical…
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Chemical abundances in bright giants of the globular cluster M62 (NGC 6266)
With the exception of Terzan 5, all the Galactic globular clusters that possess significant metallicity spreads, such as ω Cen and M22, are preferentially the more luminous clusters with extended…
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IRON-GROUP ABUNDANCES IN THE METAL-POOR MAIN-SEQUENCE TURNOFF STAR HD 84937
We have derived new, very accurate abundances of the Fe-group elements Sc through Zn (Z = 21−30) in the bright main-sequence turnoff star HD 84937 based on high-resolution spectra covering the…
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FLUORINE AND SODIUM IN C-RICH LOW-METALLICITY STARS,
We present the N, O, F, and Na abundance and 12C/13C isotopic ratio measurements or upper limits for a sample of 10 C-rich, metal-poor giant stars: 8 enhanced in s-process (CEMP-s) elements and 2…
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Neutron Star Mergers Might Not Be the Only Source of r-process Elements in the Milky Way
Probing the origin of r-process elements in the universe represents a multidisciplinary challenge. We review the observational evidence that probes the properties of r-process sites, and address them…
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The s-Process in Massive Stars at Low Metallicity: The Effect of Primary 14N from Fast Rotating Stars
The goal of this Letter is to analyze the impact of a primary neutron source on the s-process nucleosynthesis in massive stars at halo metallicity. Recent stellar models including rotation at very…
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Mn abundances in the stars of the Galactic disc with metallicities -1.0 < [Fe/H] < 0.3
In this work, we present and discuss the observations of the Mn abundances for 247 FGK dwarfs, located in the Galactic disc with metallicity −1 < [Fe/H] < +0.3. The observed stars belong to the…
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The C12(α,γ)O16 reaction and its implications for stellar helium burning
The creation of carbon and oxygen in our Universe is one of the forefront questions in nuclear astrophysics. The determination of the abundance of these elements is key to our understanding of both…
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