منابع مشابه
How Massive Are Population Iii Stars?
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...
متن کاملEvolution of Very Massive Population III Stars with Mass Accretion from Pre-Main Sequence to Collapse
We calculate the evolution of zero-metallicity Population III (Pop III) stars whose mass grows from the initial mass of ∼ 1M⊙ by accreting the surrounding gases. Our calculations cover a whole evolutionary stages from the pre-main sequence, via various nuclear burning stages, through the final core collapse or pair-creation instability phases. We adopt the following stellar massdependent accret...
متن کاملWas the Universe Reionized by Massive Population-iii Stars?
The WMAP satellite has measured a large optical depth to electron scattering after cosmological recombination of τes = 0.17 ± 0.04, implying significant reionization of the primordial gas only ∼ 200 million years after the big bang. However, the most recent overlap of intergalactic HII regions must have occurred at z . 9 based on the Lyα forest constraint on the thermal history of the intergala...
متن کاملOn the Role of Continuum-driven Eruptions in the Evolution of Very Massive Stars and Population Iii Stars
We suggest that the mass lost during the evolution of very massive stars may be dominated by optically thick, continuum-driven outbursts or explosions, instead of by steady line-driven winds. In order for a massive star to become a Wolf-Rayet star, it must shed its hydrogen envelope, but new estimates of the effects of clumping in winds from O-type stars indicate that line driving is vastly ins...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Polytechnica CTU Proceedings
سال: 2014
ISSN: 2336-5382
DOI: 10.14311/app.2014.01.0066