Modeling the Survival of Population III Stars to the Present Day

  title={Modeling the Survival of Population III Stars to the Present Day},
  author={Jayanta Dutta and Sharanya Sur and Athena Stacy and Jasjeet Singh Bagla},
  journal={The Astrophysical Journal},
Recent numerical simulations have suggested the probability of a fraction of the primordial stars being ejected from the cluster of their origin. We explore the possibility that some of these can remain on the main sequence until the present epoch. We develop a semianalytical model guided by results of cosmological simulations to study the mass accretion by these protostars as a function of the original stellar mass and other parameters such as angular momentum and gravitational drag due to… 
Metal-poor Stars Observed with the Southern African Large Telescope II. An Extended Sample
We present results from high-resolution (R ∼ 40,000) spectroscopic observations of over 200 metal-poor stars, mostly selected from the RAVE survey, using the Southern African Large Telescope. We were


The chemical signature of surviving Population III stars in the Milky Way
Cosmological simulations of Population (Pop) III star formation suggest that the primordial initial mass function may have extended to sub-solar masses. If Pop III stars with masses < 0.8 M_Sun did
The Formation of Population III Binaries from Cosmological Initial Conditions
A cosmological simulation in which the central 50 M⊙ clump breaks up into two cores having a mass ratio of two to one, with one fragment collapsing to densities of 10−8 grams per cubic centimeter is discussed.
Protostar Formation in the Early Universe
An ab initio computer simulation of the formation of primordial stars that follows the relevant atomic and molecular processes in a primordial gas in an expanding universe shows that primeval density fluctuations left over from the Big Bang can drive the formation from a tiny protostar to a massive primordial star.
The Birth of a Massive First-star Binary
We study the formation of massive Population III binary stars using a newly developed radiation hydrodynamics code with the adaptive mesh refinement and adaptive ray-tracing methods. We follow the
Formation sites of Population III star formation: The effects of different levels of rotation and turbulence on the fragmentation behaviour of primordial gas
We use the moving-mesh code arepo to investigate the effects of different levels of rotation and turbulence on the fragmentation of primordial gas and the formation of Population III stars. We
The role of the H2 adiabatic index in the formation of the first stars
The adiabatic index of H$_2\,$ ($\gamma _{\mathrm{H_2}}$) is non-constant at temperatures between $100{\,\rm{and}\,}10^4\, \mathrm{K}$ due to the large energy spacing between its rotational and
Effect of interstellar objects on metallicity of low-mass first stars formed in a cosmological model
We investigate metal pollution onto the surface of low-mass population III stars (Pop. III survivors) via interstellar objects floating in the Galactic interstellar medium. Only recently, Tanikawa et
Merge or Survive: Number of Population III Stars per Minihalo
  • H. Susa
  • Physics
    The Astrophysical Journal
  • 2019
The formation process of Population III (PopIII) stars in the mass-accretion phase is investigated by numerical experiments. The barotropic relation of primordial gas and artificial stiffening of the
Hierarchical Formation of the Galactic Halo and the Origin of Hyper Metal-Poor Stars
Extremely metal-poor (EMP) stars in the Galactic halo are unique probes into the early universe and the first stars. We construct a new program to calculate the formation history of EMP stars in the
On spherically symmetrical accretion