Astrophysical: H II regions

  • Publication
    On the Abundance Discrepancy Problem in H II Regions
    The origin of the abundance discrepancy, i.e., the fact that abundances derived from recombination lines are larger than those from collisionally excited lines...
  • Publication
    On the determination of temperatures of ionizing stars in H II regions
    Following earlier work by Shields and Searle and by Mathis, the authors define a radiation softness parameter η = (O+/O++)(S++/S+), which they recommend as a...
  • Publication
    On the Extreme Positive Feedback Star-forming Mode from Massive and Compact Super Star Clusters
    The force of gravity acting within the volume occupied by young, compact, and massive super star clusters is here shown to drive in situ all the matter...
  • Publication
    On the Feedback from Super Stellar Clusters. I. The Structure of Giant H II Regions and H II Galaxies
    We review the structural properties of giant extragalactic H II regions and H II galaxies based on two-dimensional hydrodynamic calculations and propose an...
  • Publication
    On the Formation of Spheroidal Stellar Systems and the Nature of Supersonic Turbulence in Star-forming Regions
    Models of the origin of spheroidal stellar systems, or cluster formation scenarios, need to account for empirical correlations both between scale and velocity...
  • Publication
    On the Heating Efficiency Derived from Observations of Young Super Star Clusters in M82
    Here, we discuss the mechanical feedback that massive stellar clusters provide to the interstellar medium of their host galaxy. We apply an analytic theory...
  • Publication
    On the massive star-forming capacity of molecular clouds
    Assuming that photoionization is the self-limiting process for continued star formation, we estimate the maximum number of massive (OB) stars that can form...
  • Publication
    On the Ongoing Multiple Blowout in NGC 604
    Several facts regarding the structure of NGC 604 are examined here. The three main cavities produced by the mechanical energy from massive stars, which in NGC...
  • Publication
    On the radial abundance gradients of nitrogen and oxygen in the inner Galactic disc
    We present optical spectra of nine Galactic H II regions observed with the 10.4 m Gran Telescopio Canarias telescope and located at Galactocentric distances (R...