Astrophysical: Accretion

  • Publication
    Revealing the structure of the lensed quasar Q 0957+561. I. Accretion disk size
    Aims: We aim to use signatures of microlensing induced by stars in the foreground lens galaxy to infer the size of the accretion disk in the gravitationally...
  • Publication
    Rotational broadening and Doppler tomography of the quiescent X-ray nova Centaurus X-4
    We present high- and intermediate-resolution spectroscopy of the X-ray nova Centaurus X-4 during its quiescent phase. Our analysis of the absorption features...
  • Publication
    S Ori J053825.4-024241: a classical T Tauri-like object at the substellar boundary
    We present a spectrophotometric analysis of S Ori J053825.4-024241, a candidate member close to the substellar boundary of the young (1-8 Myr), nearby (~360 pc)...
  • Publication
    S193: another non-eclipsing SW Sex star
    We present time-resolved optical spectroscopy of the cataclysmic variable S193. The emission lines are remarkably similar to those of V795 Her and exhibit high...
  • Publication
    SALT reveals the barium central star of the planetary nebula Hen 2-39
    Classical barium stars are binary systems which consist of a late-type giant enriched in carbon and slow neutron capture (s-process) elements and an evolved...
  • Publication
    Searching for flickering statistics in T CrB
    We analyse V-band photometry of the aperiodic variability in T CrB. By applying a simple idea of angular momentum transport in the accretion disc, we have...
  • Publication
    Shedding far-ultraviolet light on the donor star and evolutionary state of the neutron-star LMXB Swift J1858.6-0814
    The evolution of accreting X-ray binary systems is closely coupled to the properties of their donor stars. Consequently, we can constrain the evolutionary track...
  • Publication
    Short-term variability of the transitional pulsar candidate CXOU J110926.4‑650224 from X-rays to infrared
    CXOU J110926.4‑650224 is a candidate transitional millisecond pulsar (tMSP) with X-ray and radio emission properties reminiscent of those observed in confirmed...
  • Publication
    Simultaneous NICER and NuSTAR observations of the ultraluminous source NGC 4190 ULX-1
    Aims: We present an X-ray analysis of three different XMM-Newton observations together with simultaneous NICER and NuSTAR observations of the ultraluminous X...