Spectroscopy of low-metallicity giant Hii regions: a grid of low-metallicity stellar atmospheres
| Autor: | Peter H. Hauschildt, E. Baron, David Eichler, Shlomi Pistinner |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Photon
010504 meteorology & atmospheric sciences Thermodynamic equilibrium Metallicity FOS: Physical sciences chemistry.chemical_element Blanketing Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 7. Clean energy 01 natural sciences 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Spectroscopy 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Helium 0105 earth and related environmental sciences Line (formation) Physics Astrophysics (astro-ph) Stellar atmosphere Astronomy and Astrophysics chemistry Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 302:684-692 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1046/j.1365-8711.1999.02152.x |
| Popis: | 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 percent in the ratio of He to H-ionizing photons. |
| Databáze: | OpenAIRE |
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