Low-mass relics of early star formation
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It is shown that the recent discovery of the most iron-poor star known indicates the presence of dust in extremely low-metallicity gas, and that this dust is crucial for the formation of lower-mass second-generation stars that could survive until today.Abstract:
The earliest stars to form in the Universe were the first sources of light, heat and metals after the Big Bang The products of their evolution will have had a profound impact on subsequent generations of stars Recent studies of primordial star formation have shown that, in the absence of metals (elements heavier than helium), the formation of stars with masses 100 times that of the Sun would have been strongly favoured, and that low-mass stars could not have formed before a minimum level of metal enrichment had been reached The value of this minimum level is very uncertain, but is likely to be between 10(-6) and 10(-4) that of the Sun Here we show that the recent discovery of the most iron-poor star known indicates the presence of dust in extremely low-metallicity gas, and that this dust is crucial for the formation of lower-mass second-generation stars that could survive until today The dust provides a pathway for cooling the gas that leads to fragmentation of the precursor molecular cloud into smaller clumps, which become the lower-mass starsread more
Citations
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References
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The Nucleosynthetic Signature of Population III
TL;DR: In this article, the authors explore the nucleosynthesis of helium cores in the mass range MHe = 64-133 M? corresponding to main-sequence star masses of approximately 140-260 M?.
Journal ArticleDOI
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TL;DR: It is concluded that at most one massive metal-free star forms per pregalactic halo, consistent with recent abundance measurements of metal-poor galactic halo stars.
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The Formation of the First Stars. I. The Primordial Star-forming Cloud
TL;DR: In this paper, the physics of primordial star formation were investigated by means of three-dimensional simulations of the dark matter and gas components, under a wide range of initial conditions, including the initial spin, the total mass of the halo, the redshift of virialization, the power spectrum of the DM fluctuations, the presence of HD cooling, and the number of particles employed in the simulation.
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A stellar relic from the early Milky Way
Norbert Christlieb,Michael S. Bessell,Timothy C. Beers,Bengt Gustafsson,Andreas J. Korn,Paul S. Barklem,Torgny Karlsson,Michelle Mizuno-Wiedner,Silvia Rossi +8 more
TL;DR: This work reports the discovery of a low-mass star with an iron abundance as low as 1/200,000 of the solar value, which suggests that population III stars could still exist and that the first generation of stars also contained long-livedLow-mass objects.
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First Stars, Very Massive Black Holes, and Metals
TL;DR: In this paper, the mass fraction of pair-unstable supernovae (SNs) is estimated to be the dominant sources of the first heavy elements in the early universe.