Population III stars: hidden or disappeared?
نویسندگان
چکیده
منابع مشابه
Population III stars : hidden or disappeared ?
A Pop III/Pop II transition from massive to normal stars is predicted to occur when the metallicity of the star forming gas crosses the critical range Zcr = 10 −5±1 Z⊙. To investigate the cosmic implications of such process we use numerical simulations which follow the evolution, metal enrichment and energy deposition of both Pop III and Pop II stars. We find that: (i) due to inefficient heavy ...
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Performing one-dimensional hydrodynamical calculations coupled with nonequilibrium processes for hydrogen molecule formation, we pursue the thermal and dynamical evolution of filamentary primordial gas clouds and attempt to make an estimate on the mass of population III stars. The cloud evolution is computed from the central proton density nc ∼ 10 2−4 cm−3 up to ∼ 1013 cm−3. It is found that, a...
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Population III stars, the first generation of stars formed from primordial Big Bang material with a top–heavy IMF, should contribute substantially to the Universe reionization and they are crucial for understanding the early metal enrichment of galaxies. Therefore it is very important that these objects, foreseen by theories, are detected by observations. However PopIII stars, searched through ...
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Performing one-dimensional hydrodynamical calculations coupled with nonequilibrium processes for hydrogen molecule formation, we pursue the thermal and dynamical evolution of lamentary primordial gas clouds and attempt to make an estimate on the mass of population III stars. The cloud evolution is computed from the central proton density from n c 10 2?4 cm ?3 up to 10 13 cm ?3. It is found that...
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The transition from Population III to Population II stars is determined by the presence of a sufficient amount of metals, in particular, oxygen and carbon. The vastly different yields of these relevant metals between different initial stellar mass functions would then cause such a transition to occur at different times. We show that the transition from Pop III to Pop II stars is likely to occur...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2007
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2007.12215.x