Astrophysical: H II regions

  • Publication
    Detailed spectroscopic analysis of the Trapezium cluster stars inside the Orion nebula. Rotational velocities, stellar parameters, and oxygen abundances
    We present the results of a spectroscopic analysis of the Trapezium cluster stars inside the Orion nebula. The rotational velocities were obtained using the...
  • Publication
    Diagnostics of the Ionized ISM: The Importance of Density Fluctuations
    It is well known that when measuring electron densities in H II regions locally via emission line ratios the values observed are 100cm-3, but gobal values...
  • Publication
    Differential efficiency of massive star formation in NGC 628
    The efficiency ratio of massive star formation in the arms of the spiral NGC 628 to that in the interarm region has been determined from the sizes and positions...
  • Publication
    Distribution, sizes, and luminosity function of the HII regions in NGC 4321
    From H-alpha CCD observations taken with the 4.2-m William Herschel Telescope, a catalog of 456 H II regions of the inner zone of the spiral galaxy NGC 4321 has...
  • Publication
    Distributions, equivalent widths and metallicities of the H II regions in the spiral galaxies NGC 5457 and NGC 4395
    Using CCD observations in the narrow band filters in Hα , Hβ , [O Ii], [O Iii], [S Ii] and [S Iii] lines we have compiled a catalogue of 338 H Ii regions for...
  • Publication
    Dust in the nuclei of the Seyfert galaxies Markarian 231 and NGC 4151
    Observations carried out with a 8-13 micron grating-spectrometer of Mrk 231 and NGC 4151 are reported. The Mrk 231 data can be fitted to various thermal dust...
  • Publication
    Dusty Supernovae Running the Thermodynamics of the Matter Reinserted within Young and Massive Super Stellar Clusters
    Following the observational and theoretical evidence that points at core-collapse supernovae (SNe) as major producers of dust, here we calculate the...
  • Publication
    Efficiency of massive star formation in grand design spirals
    The present study estimates the efficiency ratio for massive star formation between the arms and the interarm disks of three grand design spirals. The estimate...
  • Publication
    Energy implications of temperature fluctuations
    We quantify the energy radiated through all the collisional lines in a photoionized nebula in the presence of temperature fluctuations in the form of hot spots...