Astrophysical: H II regions

  • Publication
    Supersonic turbulence in giant extragalactic HII regions
    I discuss in this paper the more likely physical mechanisms that could provide the energy input for the supersonic motions observed in giant extragalactic HII...
  • Publication
    Surveying the Galactic plane
    This paper discusses the Galactic plane as a case history of the application of different kinds of data bases to the problem of the large-scale Galactic...
  • Publication
    Temperature Bias and the Primordial Helium Abundance Determination
    We study the effect that the temperature structure has on the determination of the primordial helium abundance, Yp. We provide an equation linking T(O III), the...
  • Publication
    Temperature Structure and Metallicity in H II Regions
    The metallicities implied by collisionally excited lines (CELs) of heavy elements in H II regions are systematically lower than those implied by recombination...
  • Publication
    The 100 Myr Star Formation History of NGC 5471 from Cluster and Resolved Stellar Photometry
    We show that star formation in the giant H II region NGC 5471 has been ongoing during the past 100 Myr. Using Hubble Space Telescope/Wide-Field Planetary Camera...
  • Publication
    The Abundance Gradient in NGC 3344
    The steep abundance gradient found by McCall, Shields, and Rybski (1981) in the Sbc galaxy NGC 3344 is confirmed by a measurement of the electron temperature in...
  • Publication
    The abundances of O, S, Cl, N, Ar, He and C in seven Galactic H bt II regions regions
    An analysis of CCD spectra in the range lambda lambda4200 -8775, obtained at several positions of seven bright Galactic H Ii regions, with galactocentric...
  • Publication
    The Aurora radiation-hydrodynamical simulations of reionization: calibration and first results
    We introduce a new suite of radiation-hydrodynamical simulations of galaxy formation and reionization called Aurora. The Aurora simulations make use of a...
  • Publication
    The bipolar H II region S 201
    The authors discuss the nature of S 201 in the light of new optical and infrared observations, in terms of the interaction between an evolved H II region and a...