Spectroscopy of low-metallicity giant H II regions: A grid of low-metallicity stellar atmospheres Academic Article uri icon

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.

publication date

  • February 1, 1999