Journal: Astrophysics and Space Science

  • Publication
    New Views on the Early Evolution of Oxygen in the Galaxy
    We discuss results on the oxygen abundance in a sample of 23 metal-poor (-3.0≤ [Fe/H] ≤ -0.3) unevolved stars and one giant. High resolutionspectroscopy of OH...
  • Publication
    NGC 3109: Halo/Disk Structures in Faint Galaxies
    We present here preliminary results of our wide-field study of NGC 3109: a low luminosity galaxy in the outskirts of the Local Group. Its edge-on orientation...
  • Publication
    NGC 3521: Stellar Counter-Rotation Induced by a Bar Component
    The spiral galaxy NGC 3521 exhibits apparently normal kinematic properties of gas and stars along its major axis. However, the analysis of the LOSVD reveals...
  • Publication
    Non-instantaneous gas recycling and chemical evolution in N-body disk galaxies
    After briefly recalling basic facts about the metallicity gradients inspiral galaxies, we summarize two recent N-body gas-dynamical modelsthat implement a non...
  • Publication
    On the initial cluster mass distribution inferred from synthesis models
    In this contribution we examine the problem of inferring ages and initial cluster masses from synthesis models at the limit of low-mass clusters ( M≤ a few ×104...
  • Publication
    On the Light-Profiles of Spiral Galaxy Bulges and the Hubble Sequence for Spirals
    Recent studies have claimed that the Hubble sequence of late-type spirals, and spirals in general, is scale-free. Within the photometric data used in these...
  • Publication
    On the Nature of Damped LYα Systems: Clues from Determinations of Elemental Abundance Ratios
    We present a study of the [α/Fe-peak] and [N/α] abundance ratios in Damped Lyα (DLA) systems. By using ratios of undepleted elements ([S/Zn] and [N/S]) or when...
  • Publication
    On the Origin of S0 Stellar Populations
    We investigate a one-zone chemo-photometric evolutionary model of truncated spiral galaxies with and without starbursts in order to explore the origin of the...
  • Publication
    On the origin of the compact H ii regions around massive stellar clusters
    The existence of compact H ii regions around massive stellar clusters with ages exceeding several Myr challenges our understanding of the physical processes...