Astrofísicas: Regiones H II

  • Publicación
    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...
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    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...
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    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...
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    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...
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    The Calibration of the O/H Abundance Indicators for Extragalactic H II Regions based on O II Recombination Lines
    Based on O II recombination lines we present a new calibration (called O II_{RL}) of Pagel's O_{23} indicator to determine the O/H abundance ratio in...
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    The chemical composition gradient across M 33
    The abundance gradient in M 33 is studied on the basis of IPCS and CCD data on emission lines in selected H II regions, using O II, O III, S II, and S III in...
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    The chemical composition of Galactic ring nebulae around massive stars
    We present deep spectra of ring nebulae associated with Wolf-Rayet (WR) and O-type stars: NGC 6888, G2.4+1.4, RCW 58, S 308, NGC 7635 and RCW 52. The data have...
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    The CO structure of NGC 7027 - A bipolar nebula in the making
    Intermediate resolution mapping and limited off-center spectroscopy of the post-main-sequence molecular outflow source NGC 7027 are presented. The CO envelope...
  • Publicación
    The core-halo structure of IC 418
    Deep spectra of the planetary nebula IC 418 were obtained in the wavelength range 4190-5850 A. The data made it possible to map an extended halo about the...