7 papers
The Distribution of X-ray Dips with Orbital Phase in Cygnus X-1
M. Balucinska-Church, M. J. Church, P. A. Charles +3
We present results of a comprehensive study of the distribution of absorption dips with orbital phase in Cygnus X-1. Firstly, the distribution was obtained using archival data from…
The mass of X-Ray Nova Scorpii 1994 (=GRO J1655--40)]
T. Shahbaz, F. van der Hooft, J. Casares +2
We have obtained high and intermediate resolution optical spectra of the black-hole candidate Nova Sco 1994 in May/June 1998, when the source was in complete (X-ray) quiescence. We…
Infrared spectroscopy of low-mass X-ray binaries II
R. M. Bandyopadhyay, T. Shahbaz, P. A. Charles +1
Using CGS4 on UKIRT, we have obtained 2.00-2.45 micron infrared spectra of a number of low-mass X-ray binaries including Sco X-1, Sco X-2, and GX13+1. Sco X-1 shows emission lines…
X-ray irradiation in low mass binary systems
G. Dubus, J. -P. Lasota, J. -M. Hameury +1
We calculate self-consistent models of X-ray irradiated accretion discs in close binary systems. We show that a point X-ray source powered by accretion and located in the disc plan…
Soft X-ray transient light curves as standard candles: exponential versus linear decays
T. Shahbaz, P. A. Charles, A. R. King
A recent paper by King and Ritter (1998: hereafter KR) proposed that the light curves of soft X-ray transients (SXTs) are dominated by the effect of irradiation of the accretion di…
An ``outside-in'' outburst of Aql X--1
T. Shahbaz, R. M. Bandyopadhyay, P. A. Charles +5
We present optical spectroscopy and optical and infrared photometry of the neutron star soft X-ray transient Aql X--1 during its X-ray outburst of August 1997. By modelling the X-r…