Journal: Astronomy and Astrophysics

  • Publication
    The optical counterparts of accreting millisecond X-ray pulsars during quiescence
    Context: Eight accreting millisecond X-ray pulsars (AMXPs) are known to date. Although these systems are well studied at high energies, very little information...
  • Publication
    The optical nebulae around the symbiotic Miras He 2-147, HM Sagittae and V1016 Cygni
    We present narrowband images and [Nii]lambda 658.3 nm spectra, obtained under sub-arcsec seeing conditions, of the extended nebulae around the symbiotic Miras...
  • Publication
    The optical properties of low redshift radio galaxies
    We present morphological and photometric properties of 79 low redshift (z=-24.0 with a clear trend for FRI sources to be ~ 0.5 mag brighter than FRII galaxies...
  • Publication
    The optical SN 2012bz associated with the long GRB 120422A
    Aims: The association of Type Ic supernovae (SNe) with long-duration gamma-ray bursts (GRBs) is well established. We endeavor, through accurate ground-based...
  • Publication
    The orbit of the close spectroscopic binary varepsilon Lup and the intrinsic variability of its early B-type components
    We subjected 106 new high-resolution spectra of the double-lined spectroscopic close binary varepsilon Lup, obtained in a time-span of 17 days from two...
  • Publication
    The orbital period of the recurrent X-ray transient in Terzan 6
    Four or five new outbursts were detected of the bright X-ray transient GRS 1747-312 in the globular cluster Terzan 6 between 1996 and 1999, through monitoring...
  • Publication
    The orientation of WARPS in the Local Group.
    The three major spiral galaxies in the Local Group are known to be warped. The question is investigated of whether or not these three warps are aligned. Using...
  • Publication
    The origin of the ionization of the diffuse interstellar medium in spiral galaxies. I. Photometric measurements
    We present a complete study of the diffuse ionized gas (DIG) in a sample of six spiral galaxies (NGC 157, NGC 3359, NGC 3631, NGC 6764, NGC 6951, NGC 7479)...
  • Publication
    The origin of the ionization of the diffuse ionized gas in spirals. II. Modelling the distribution of ionizing radiation in NGC 157
    In this paper we make a quantitative study of the hypothesis that the diffuse Hα emitted from the discs of spiral galaxies owes its origin to the ionizing...