Astrophysical: Accretion

  • Publication
    Optical Studies of V:404-CYGNI the X-Ray Transient GS:2023+338 - Part Three - the Secondary Star and Accretion Disc
    We present new results from the analysis of 55 high-resolution spectra of V404 Cyg (the optical counterpart of the X-ray transient GS 2023+338) taken in 1991...
  • Publication
    Optical, X-ray, and γ-ray observations of the candidate transitional millisecond pulsar 4FGL J0427.8-6704
    We present an optical, X-ray, and γ-ray study of 1SXPS J042749.2-670434, an eclipsing X-ray binary that has an associated γ-ray counterpart, 4FGL J0427.8-6704...
  • Publication
    Orbital and quasi-periodic optical variations in the black hole X-ray binary V404 CYG
    We present 2 weeks of CCD photometry of V404 Cyg, the optical counterpart of the soft X-ray transient (SXT) GS 2023+338, taken from La Palma in 1992 July. The R...
  • Publication
    Orbital parameters of the microquasar LS I +61 303
    New optical spectroscopy of the high-mass X-ray binary microquasar LS I +61 303 is presented. Eccentric orbital fits to our radial velocity measurements yield...
  • Publication
    Parallel tracks in infrared versus X-ray emission in black hole X-ray transient outbursts: a hysteresis effect?
    We report the discovery of a new hysteresis effect in black hole X-ray binary state transitions, that of the near-infrared (NIR) flux (which most likely...
  • Publication
    Periodic variability during the X-ray decline of 4U 1636-53
    We report the onset of a large amplitude, statistically significant periodicity (~46 d) in the Rossi X-ray Timing Explorer/All Sky Monitor (RXTE/ASM) data of...
  • Publication
    Phase-resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during the 2008 outburst
    Aims: We obtained phase-resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during its outburst in 2008 to find a signature of the...
  • Publication
    Photoionization instability of the Fe K absorbing plasma in the neutron star transient AX J1745.6-2901
    AX J1745.6-2901 is a low-mass X-ray binary with an accreting neutron star, showing clear evidence for highly ionized absorption. Strong ionized Fe Kα and Kβ...
  • Publication
    Polarized infrared emission from X-ray binary jets
    Near-infrared (NIR) and optical polarimetric observations of a selection of X-ray binaries are presented. The targets were observed using the Very Large...