Photoionization Models of Metal-poor Extragalactic H o Regions And the Primordial Helium Abundance
We discuss the effects of collisional enhancement of Balmer lines on the determination of the primordial helium abundance. To this aim, we present a photoionization model of the metal-poor extragalactic H II region SBS 0335-052. We show that the derived helium abundance (Y ) of this H II region depe...
Guardat en:
| Publicat a: | Revista Mexicana de Astronomía y Astrofísica |
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| Autors principals: | , , |
| Format: | Artigo |
| Idioma: | Inglês |
| Publicat: |
Universidad Nacional Autónoma de México
2003
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| Matèries: | |
| Accés en línia: | https://www.redalyc.org/articulo.oa?id=57101814 |
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