• Corpus ID: 11066947

Photoionization models of metal-poor extragalactic H II regions and the primordial helium abundance

@article{Luridiana2003PhotoionizationMO,
  title={Photoionization models of metal-poor extragalactic H II regions and the primordial helium abundance},
  author={Valentina Luridiana and Antonio Peimbert and M. Peimbert},
  journal={Revista Mexicana De Astronomia Y Astrofisica},
  year={2003},
  volume={18},
  pages={56-59}
}
We discuss the eects 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 depends on the amount of collisional excitation aecting the Balmer lines, both directly (through an underestimation of the actual He/H ratio) and indirectly (through an overestimation of the interstellar… 

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Instituto de Astronomía (UNAM), Ap.do postal 70-264
  • Instituto de Astronomía (UNAM), Ap.do postal 70-264