Tipo de publicación: Con árbitro

  • Publicación
    On the nature of two low-dot{M} X-ray bursters: 1RXS J170854.4-321857 and 1RXS J171824.2-402934
    We carried out Chandra observations of two low-luminosity low-mass X-ray binaries, 1RXS J170854.4-321857 and 1RXS J171824.2-402934, for which previously single...
  • Publicación
    On the nitrogen abundance of fast, low-ionization emission regions: the outer knots of the planetary nebula NGC 7009
    We have constructed a 3D photoionization model of a planetary nebula (PN) similar in structure to NGC 7009 with its outer pair of knots (also known as FLIERs -...
  • Publicación
    On the non-evolution of the dependence of black hole masses on bolometric luminosities for QSOs
    There are extremely luminous quasi stellar objects (QSOs) at high redshift which are absent at low redshift. The lower luminosities at low redshifts can be...
  • Publicación
    On the O/Fe versus Fe/H relationship and the progenitors of type I supernovae
    The new observational O/Fe versus Fe/H abundance relationship for halo stars is studied in terms of several models of chemical evolution for the solar...
  • Publicación
    On the observational diagnostics to separate classical and disk-like bulges
    Flattened bulges with disk-like properties are considered to be the end product of secular evolution processes at work in the inner regions of galaxies. On the...
  • Publicación
    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...
  • Publicación
    On the optical counterparts of radio transients and variables
    We investigate the relation between the radio (Fr) and optical (Fo) flux densities of a variety of classes of radio transients and variables, with the aim of...
  • Publicación
    On the optical variability of the QSO PKS 2128-123
    Although the QSO PKS 2128 - 123 appears as highly variable in the I band, with Delta-I of up to 1.69 mag, it is a moderate amplitude variable object in the...
  • Publicación
    On the orbital velocity of isolated galaxy pairs: a test of gravity in the low acceleration regime
    The dynamics of isolated galaxy pairs represents an important tool to investigate the behaviour of gravity in the low acceleration regime. Statistical analysis...