Astrophysical: H II regions

  • Publication
    On the Size and Luminosity versus Velocity Dispersion Correlations from the Giant H II Regions in the Irregular Galaxy NGC 4449
    Here we present the size and luminosity versus velocity dispersion empirical correlations for the giant H II regions in the large irregular galaxy NGC 4449. We...
  • Publication
    On the supersonic turbulence of NGC 604
    Two-dimensional high spatial resoultion Fabry-Perot observations with TAURUS 2 at the William Herschel Telescope in La Palma, over the inner central regions of...
  • Publication
    On the α-Element Abundance Gradients in the Disk of the Sculptor Spiral Galaxy NGC 300
    We have carried out a detailed spectral analysis of six early B-type supergiants in the Sculptor Group spiral galaxy NGC 300. To this end, we used state-of-the...
  • Publication
    Optical and infrared observations of the H II region S201
    Optical spectroscopy, H-alpha interferometry, and near-IR mapping and photometry of the bipolar H II region S201 are reported. The observations are used to...
  • Publication
    Optical and near IR galaxy number counts in the GOYA survey. The ages of Ellipticals
    Based on the GOYA Photometric Survey of the HST Groth-Westphal strip, we present galaxy number counts in B and Ks bands together with a model that...
  • Publication
    Optical Recombination Lines of Heavy Elements in Giant Extragalactic H II Regions
    We present high-resolution observations of the giant extragalactic H II regions NGC 604, NGC 2363, NGC 5461, and NGC 5471, based on observations taken with the...
  • Publication
    Optical spectroscopy and near-infrared mapping of S 106
    The bipolar outflow region S 106 is studied with optical spectroscopy and IR mapping techniques. The physical conditions in the ionized region, the density...
  • Publication
    Oxygen abundance in M101 HII regions (Cedres+, 2004)
    We present the oxygen abundance determination for 90 HII regions in the inner parts of the grand design galaxy M101. The abundances were derived employing the P...
  • Publication
    Photoionization Models of Metal-poor Extragalactic H 0 Regions and the Primordial Helium Abundance
    We discuss the effects of collisional enhancement of Balmer lines on the determination of the primordial helium abundance. To this aim, we present a...