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Cited by 258

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Zero-Metallicity Stars and the Effects of the First Stars on Reionization

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Tumlinson, Jason, Shull, J. Michael·2000·The Astrophysical Journal

Abstract

We present stellar structure and atmosphere models of metal-free stars and examine them from a cosmological point of view. Metal-free stars exhibit high effective temperatures and small sizes relative to metal-enriched stars of equal mass. These unique physical characteristics enhance the ionizing photon production by metal-free stars, particularly in the He ii (hnu>/=4 ryd) continuum. The star formation rate of metal-free stars necessary to reionize the hydrogen in the universe by z=5 is consistent with the inferred star formation rate at that epoch. However, the hard stellar spectra are inconsistent with the observations of He ii opacity in the intergalactic medium (IGM) at z approximately 3, indicating that the period of metal-free star formation ended before that epoch. We examine the effects of these stars on the ionization balance of the IGM, the radiative feedback of the first luminous objects, and the extragalactic radiation field. We comment on the prospects for detecting metal-free stellar populations with the lambda1640 and lambda4686 recombination lines of He ii.

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Metadata

Authors
Tumlinson, J., & Shull, J. M.
Venue
The Astrophysical Journal
Published
2000-01-10
Volume
528
Issue
2
Pages
L65-L68
ISSN
0004-637X (ISSN-L)
OpenAlex
W2078875989
Cited by
258
References
3
FWCI
16.80
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Zero-Metallicity Stars and the Effects of the First Stars on Reionization. https://app.cochat.ai/papers/10.1086/312432
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Tumlinson, J., & Shull, J. M. (2000). Zero-Metallicity Stars and the Effects of the First Stars on Reionization. The Astrophysical Journal. https://doi.org/10.1086/312432

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