Spectroscopy of low-metallicity giant H II regions: A grid of low-metallicity stellar atmospheres

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

doi:10.1046/j.1365-8711.1999.02152.x

Spectroscopy of low-metallicity giant H II regions: A grid of low-metallicity stellar atmospheres

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

Department of Physics

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

1 Scopus citations

Abstract

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

Original language	English
Pages (from-to)	684-692
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	302
Issue number	4
DOIs	https://doi.org/10.1046/j.1365-8711.1999.02152.x
State	Published - 1 Feb 1999

Keywords

Galaxies: abundances
Galaxies: irregular
H II regions
Stars: atmospheres

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1046/j.1365-8711.1999.02152.x

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

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year = "1999",

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AU - Pistinner, S. L.

AU - Hauschildt, P. H.

AU - Eichler, D.

AU - Baron, E. A.

PY - 1999/2/1

Y1 - 1999/2/1

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

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

KW - Galaxies: abundances

KW - Galaxies: irregular

KW - H II regions

KW - Stars: atmospheres

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U2 - 10.1046/j.1365-8711.1999.02152.x

DO - 10.1046/j.1365-8711.1999.02152.x

M3 - Article

AN - SCOPUS:0042208881

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SP - 684

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

Spectroscopy of low-metallicity giant H II regions: A grid of low-metallicity stellar atmospheres

Abstract

Keywords

ASJC Scopus subject areas

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