Results 11 to 20 of about 107,692 (266)
Acta Polytechnica, 2013 Pop III stars are the key to the character of primeval galaxies, the first heavy elements, the onset of cosmological reionization, and the seeds of supermassive black holes.
Daniel J. Whalen
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Astronomy & Astrophysics, 2013 Detailed abundances of the elements produced by r-process nucleosynthesis in various circumstances are our best observational clues to their origin, since the site(s) of r-element production is(are) still not known with certainty. A small fraction of extremely metal-poor (EMP) stars exhibit excesses of heavy neutron-capture elements produced in the r ...
Siquerira Mello Jr., C. +16 more
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Formation of the first stars [PDF]
Proceedings of 11th Symposium on Nuclei in the Cosmos — PoS(NIC XI), 2005 Review, revised version; now in print, Rep. Prog. Phys. (2013), 52 pages, 14 figures (for high-resolution, please see the journal)
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The Astrophysical Journal, 2003 The external pollution of the first stars in the Galaxy is investigated. The first stars were born in clouds composed of the pristine gas without heavy elements. These stars accreted gas polluted with heavy elements while they still remained in the cloud. As a result, it is found that they exhibit a distribution with respect to the surface metallicity.
Shigeyama, Toshikazu +2 more
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Star Formation Under Cosmological Conditions [PDF]
EPJ Web of Conferences, 2020 The first stars have transformed the universe from the infrared background to the light. Thereby, this so called “dark age” ended by re-ionization through the ultraviolet light of the first stars.
El Eid Mounib F., Saad Cynthia
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The first stars in the Universe
Monthly Notices of the Royal Astronomical Society: Letters, 2006 Abstract Large telescopes have allowed astronomers to observe galaxies that formed as early as 850 million years after the big bang. We predict when the first star that astronomers can observe (i.e. in our past light cone) formed in the Universe, accounting for the first time for the size of the Universe and for three essential ...
Naoz, Smadar +2 more
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Proceedings of the International Astronomical Union, 2007 AbstractThe formation of the first generations of stars at redshifts z ≥ 15 − 20 signaled the transition from the simple initial state of the universe to one of ever increasing complexity. We here review recent progress in understanding the assembly process of the first galaxies, starting with cosmological initial conditions and modelling the detailed ...
Johnson, Jarrett L. +2 more
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Symposium - International Astronomical Union, 2002 The possible nature of the first generation of stars is considered, using a star of 25M⊙as an example. General nucleosynthesis and the production of CNO catalysts is examined in detail. The increase in neutron excess and its significance for yields from explosive burning is discussed.
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The first stars: CEMP-no stars and signatures of spinstars [PDF]
Astronomy & Astrophysics, 2015 (Abridged) The CEMP--no stars are "carbon-enhanced-metal-poor" stars that in principle show no evidence of s-- and r--elements from neutron captures. We try to understand the origin and nucleosynthetic site of their peculiar CNO, Ne--Na, and Mg--Al abundances.
{Maeder} A., {Meynet} G., {Chiappini} C.
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Machine Learning Detects Multiplicity of the First Stars in Stellar Archaeology Data
The Astrophysical Journal, 2023 In unveiling the nature of the first stars, the main astronomical clue is the elemental compositions of the second generation of stars, observed as extremely metal-poor (EMP) stars, in the Milky Way.
Tilman Hartwig +4 more
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