THE FIRST STARS: A LOW-MASS FORMATION MODE

We perform numerical simulations of the growth of a Population III stellar system under photodissociating feedback. We start from cosmological initial conditions at z = 100, self-consistently following the formation of a minihalo at z = 15 and the subsequent collapse of its central gas to high densi...

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Bibliographic Details
Published in:The Astrophysical journal 2014-04, Vol.785 (1), p.1-18
Main Authors: Stacy, Athena, Bromm, Volker
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Asymptotic properties
ASYMPTOTIC SOLUTIONS
Collapse
COMPARATIVE EVALUATIONS
Computer simulation
COMPUTERIZED SIMULATION
COSMOLOGY
DENSITY
Enrichment
Formations
Initial conditions
LIFETIME
MASS
PROTOSTARS
STARS
Stellar systems
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Summary:We perform numerical simulations of the growth of a Population III stellar system under photodissociating feedback. We start from cosmological initial conditions at z = 100, self-consistently following the formation of a minihalo at z = 15 and the subsequent collapse of its central gas to high densities. The simulations resolve scales as small as ~ 1 AU, corresponding to gas densities of 10 super(16) cm super(-3). Using sink particles to represent the growing protostars, we evolve the stellar system for the next 5000 yr. We find that this emerging stellar group accretes at an unusually low rate compared with minihalos which form at earlier times (z = 20-30), or with lower baryonic angular momentum. The stars in this unusual system will likely reach masses ranging from
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/785/1/73