Results 21 to 30 of about 158,293 (319)
Metal-rich stars are less suitable for the evolution of life on their planets
Nature Communications, 2023 Atmospheric ozone and oxygen protect the terrestrial biosphere against harmful ultraviolet (UV) radiation. Here, we model atmospheres of Earth-like planets hosted by stars with near-solar effective temperatures (5300 to 6300 K) and a broad range of ...
Anna V. Shapiro +9 more
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Massive first star binaries as new tools for Galactic archaeology [PDF]
EPJ Web of Conferences, 2022 Binary systems are important probes of the origin of stars with peculiar chemical features through the interactions between two stars. We have studied the evolution of a metal-free massive binary after the collision of the supernova ejecta with a low ...
Suda Takuma +4 more
doaj +1 more source
Chemistry of the Most Metal-poor Stars in the Bulge and the z > 10 Universe [PDF]
, 2014 Metal-poor stars in the Milky Way are local relics of the epoch of the first stars and the first galaxies. However, a low metallicity does not prove that a star formed in this ancient era, as metal-poor stars form over a range of redshift in different ...
Casey, Andrew R., Schlaufman, Kevin C.
core +2 more sources
TITANS: the metal-poor reference stars
, 2021 Tracing the history of chemical evolution of the Milky Way requires the determination of chemical abundances in a large assortment of stars with accurate stellar parameters. Nonetheless, the accuracy achieved in the derived astrophysical parameters is still insufficient, mainly because of the paucity of adequate calibrators, particularly in the metal ...
Giribaldi, Riano +3 more
openaire +3 more sources
Detailed Abundances of Two Very Metal-Poor Stars in Dwarf Galaxies [PDF]
, 2012 The most metal-poor stars in dwarf spheroidal galaxies (dSphs) can show the nucleosynthetic patterns of one or a few supernovae (SNe). These SNe could have zero metallicity, making metal-poor dSph stars the closest surviving links to Population III stars.
Cohen, Judith G., Kirby, Evan N.
core +3 more sources
NLTE Analysis of Y i and Y ii in the Atmospheres of FGK Stars
The Astrophysical Journal, 2023 The nonlocal thermodynamical equilibrium (NLTE) line formation of Y i and Y ii is considered in 1D LTE model atmospheres of FGK-type stars. The model atom was constructed with the most up-to-date atomic data, including quantum cross sections and rate ...
Sofya Alexeeva +7 more
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A peculiarity of metal-poor stars with planets? [PDF]
Astronomy & Astrophysics, 2008 4 pages, 2 figures, accepted for publication in A& ...
openaire +6 more sources
Experimental Astronomy, 2022 In this contribution I provide an overview of the study of metal poor stars, with an emphasis on the efforts that are on-going to find large number of these rare objects. These efforts will provide, in the next few years, an interesting number of targets for which it will be desirable to have a chemical inventory, as complete as possible.
openaire +3 more sources
On the Abundance of Potassium in Metal-Poor Stars [PDF]
Publications of the Astronomical Society of Japan, 2002 Abstract Based on extensive statistical-equilibrium calculations, we performed a non-LTE analysis of the K i 7699 equivalent-width data of metal-deficient stars for the purpose of clarifying the behavior of the photospheric potassium abundance in disk/halo stars.
Masahide Takada-Hidai +4 more
openaire +4 more sources
The COMBS survey I : Chemical Origins of Metal-Poor Stars in the Galactic Bulge [PDF]
, 2019 19 pages, 5 tables, accepted to MNRASChemistry and kinematic studies can determine the origins of stellar population across the Milky Way. The metallicity distribution function of the bulge indicates that it comprises multiple populations, the more metal-
Asplund, Martin +9 more
core +2 more sources