Astrophysical: H II regions

  • Publication
    Probing O-enrichment in C-rich dust planetary nebulae
    The abundance of O in planetary nebulae (PNe) has been historically used as a metallicity indicator of the interstellar medium (ISM), where they originated; e.g...
  • Publication
    Properties of the H II Region Populations of M51 and NGC 4449 from Hα Images with the Advanced Camera for Surveys on the Hubble Space Telescope
    We have used images from the Advanced Camera for Surveys on the Hubble Space Telescope in Hα, and in the neighboring continuum, to produce flux-calibrated...
  • Publication
    Radial brightness profiles of extragalactic H II regions
    We present a systematic study of the radial brightness profiles in H alpha of a set of H ii regions in 6 late-type spiral galaxies, complete down to stated...
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    Radial metallicity gradients with Galactic nebular probes
    The study of radial metallicity gradients in the disc of the Milky Way is a powerful tool to understand the mechamisms that have been acting in the formation...
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    Radial velocities of optical lines in three bright Galactic HII regions
    We present heliocentric radial velocities for a large number of emission lines covering all the optical spectral range for two slit positions of the Galactic H...
  • Publication
    Revised Primordial Helium Abundance Based on New Atomic Data
    We have derived a primordial helium abundance of Yp=0.2477+/-0.0029, based on new atomic physics computations of the recombination coefficients of He I and of...
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    Revisiting the radial abundance gradients of nitrogen and oxygen of the Milky Way
    We present spectra obtained with the 10.4 m Gran Telescopio Canarias telescope of 13 Galactic H II regions, most of them of very low ionization degree. The...
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    SDSS galaxies with double-peaked emission lines: double starbursts or active galactic nuclei?
    With the aim of investigating galaxies with two strong simultaneous starbursts, we have extracted a sample of galaxies with double-peaked emission lines in...
  • Publication
    Search for the near infrared counterparts of compact H II regions and/or H2O masers.
    The authors present the preliminary results of a search for near-infrared counterparts of compact H II regions and/or H2O masers in the Galactic Plane, probably...