منابع مشابه
Detecting Primordial Stars
We study the detectability of primordial metal-free stars, both through direct searches for their emission, as well as searches for the resulting supernovae. We show that enrichment is a local process that takes place over an extended redshift range. While the duration of the transition from a metal-free to an enriched universe depends on several unknown factors, in all models late-forming meta...
متن کاملDetecting Primordial Stars
We discuss the expected properties of the first stellar generations in the Universe. We find that it is possible to discern truly primordial populations from the next generation of stars by measuring the metallicity of high-z star forming objects. The very low background of the future James Webb Space Telescope (JWST) will enable it to image and study first-light sources at very high redshifts,...
متن کاملOn the Formation of Massive Primordial Stars
We investigate the formation by accretion of massive primordial protostars in the range 10 to 300 M⊙. The high accretion rate used in the models (Ṁ = 4.4 × 10 M⊙ yr ) causes the structure and evolution to differ significantly from those of both present-day protostars and primordial zero-age main sequence stars. After an initial expansion of the radius (for M∗ . 12M⊙), the protostar undergoes an...
متن کاملSimulating the Formation of Primordial Proto-Stars
We study the formation of primordial proto-stars in a ACDM universe using high-resolution cosmological simulations. Our approach includes all the relevant atomic and molecular physics necessary to follow the thermal evolution of a prestellar gas cloud to very high densities. We describe the numerical implementation of the physics. We show the results of a simulation of the formation of primordi...
متن کاملStructure, Evolution and Nucleosynthesis of Primordial Stars
The evolution of population III stars (Z = 0) is followed from the pre-main sequence phase up to the AGB phase for intermediate-mass stars and up to C ignition in more massive stars. Our grid includes 11 stars, covering the mass range 0.8 to 20 M . During the H and He core burning phases an overshooting characterized by d = 0.20HP was applied and during the AGB phase a small extension of the co...
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ژورنال
عنوان ژورنال: New Astronomy Reviews
سال: 2006
ISSN: 1387-6473
DOI: 10.1016/j.newar.2005.11.009