Astrofísicas: Nucleosíntesis

  • Publicación
    First stars XI. Chemical composition of the extremely metal-poor dwarfs in the binary CS 22876-032
    Context: Unevolved metal-poor stars constitute a fossil record of the early Galaxy, and can provide invaluable information on the properties of the first...
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    Fundamental physics with ESPRESSO: a new determination of the D/H ratio towards PKS1937-101
    Primordial abundances of light elements are sensitive to the physics of the early Universe and can directly constrain cosmological quantities, such as the...
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    Galactic evolution of oxygen. OH lines in 3D hydrodynamical model atmospheres
    Context. Oxygen is the third most common element in the Universe. The measurement of oxygen lines in metal-poor unevolved stars, in particular near-UV OH lines...
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    Galactic planetary nebulae with precise nebular abundances as a tool to understand the evolution of asymptotic giant branch stars
    We present nucleosynthesis predictions (HeCNOCl) from asymptotic giant branch (AGB) models, with diffusive overshooting from all the convective borders, in the...
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    Gamma-ray line emission from OB associations and young open clusters. II. The Cygnus region
    Gamma-ray and microwave observations of the Cygnus region reveal an intense signal of 1.809 Me line emission, attributed to radioactive decay of 26, that is...
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    Heavy Element Nucleosynthesis in the Brightest Galactic Asymptotic Giant Branch Stars
    We present updated calculations of stellar evolutionary sequences and detailed nucleosynthesis predictions for the brightest asymptotic giant branch (AGB) stars...
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    Heavy-element yields and abundances of asymptotic giant branch models with a Small Magellanic Cloud metallicity
    We present new theoretical stellar yields and surface abundances for asymptotic giant branch (AGB) models with a metallicity appropriate for stars in the Small...
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    Hot bottom burning and s-process nucleosynthesis in massive AGB stars at the beginning of the thermally-pulsing phase
    We report the first spectroscopic identification of massive Galactic asymptotic giant branch (AGB) stars at the beginning of the thermal pulse (TP) phase. These...
  • Publicación
    Identification of Near-infrared [Se iii] and [Kr vi] Emission Lines in Planetary Nebulae
    We identify [Se iii] 1.0994 μm in the planetary nebula (PN) NGC 5315 and [Kr vi] 1.2330 μm in three PNe from spectra obtained with the Folded-Port InfraRed...