On the primordial helium abundance and spectroscopic uncertainties

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

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
Pages (from-to)151-161
Number of pages11
JournalPhysics Reports
Issue number3-5
StatePublished - 1 Jan 1999


  • 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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