On the primordial helium abundance and spectroscopic uncertainties

S. L. Pistinner; P. H. Hauschildt; D. Eichler; E. Baron

doi:10.1016/S0370-1573(98)00096-9

On the primordial helium abundance and spectroscopic uncertainties

S. L. Pistinner, P. H. Hauschildt, D. Eichler, E. Baron

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

To assess the uncertainties in primordial helium abundance determination by nebular codes, we calculate a grid of OB stellar atmospheres at low metallicities, including both non-local thermodynamic equilibrium (NLTE) and metal line blanketing effects. The more sophisticated stellar atmosphere models we use can differ from LTE models by as much as 40% in the ratio of He to H-ionizing photons.

Original language	English
Pages (from-to)	151-161
Number of pages	11
Journal	Physics Reports
Volume	311
Issue number	3-5
DOIs	https://doi.org/10.1016/S0370-1573(98)00096-9
State	Published - 1 Jan 1999

Keywords

98.58.Ge
98.58.Hf
98.62.-g
Abundances galaxies
Galaxies
Irregular-H II regions

ASJC Scopus subject areas

Physics and Astronomy (all)

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10.1016/S0370-1573(98)00096-9

Cite this

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abstract = "To assess the uncertainties in primordial helium abundance determination by nebular codes, we calculate a grid of OB stellar atmospheres at low metallicities, including both non-local thermodynamic equilibrium (NLTE) and metal line blanketing effects. The more sophisticated stellar atmosphere models we use can differ from LTE models by as much as 40% in the ratio of He to H-ionizing photons.",

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AU - Pistinner, S. L.

AU - Hauschildt, P. H.

AU - Eichler, D.

AU - Baron, E.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - To assess the uncertainties in primordial helium abundance determination by nebular codes, we calculate a grid of OB stellar atmospheres at low metallicities, including both non-local thermodynamic equilibrium (NLTE) and metal line blanketing effects. The more sophisticated stellar atmosphere models we use can differ from LTE models by as much as 40% in the ratio of He to H-ionizing photons.

AB - To assess the uncertainties in primordial helium abundance determination by nebular codes, we calculate a grid of OB stellar atmospheres at low metallicities, including both non-local thermodynamic equilibrium (NLTE) and metal line blanketing effects. The more sophisticated stellar atmosphere models we use can differ from LTE models by as much as 40% in the ratio of He to H-ionizing photons.

KW - 98.58.Ge

KW - 98.58.Hf

KW - 98.62.-g

KW - Abundances galaxies

KW - Galaxies

KW - Irregular-H II regions

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U2 - 10.1016/S0370-1573(98)00096-9

DO - 10.1016/S0370-1573(98)00096-9

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JF - Physics Reports

IS - 3-5

ER -

On the primordial helium abundance and spectroscopic uncertainties

Abstract

Keywords

ASJC Scopus subject areas

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