271 citations · 4.9k across the 147 of their papers we have counts for
7 papers · 1 filter
The Orbital Period of HDE226868/Cyg X-1
J. LaSala, P. A. Charles, R. A. D. Smith +2
We present epoch 1996, high-quality radial velocity data for HDE 226868, the optical counterpart of Cygnus X-1. Combining our results with all published historical data, we have de…
The eclipsing X-ray pulsar X-7 in M33
G. Dubus, P. A. Charles, K. S. Long +2
Using our extensive ROSAT X-ray observations of M33, we confirm a 3.45 day eclipse period for the Einstein source X-7 (Larson & Schulman, 1997) and discover evidence for a 0.31-s p…
Period derivative of the M15 X-ray Binary AC211/X2127+119
L. Homer, P. A. Charles
We have combined Rossi X-ray Timing Explorer observations of X2127+119, the low-mass X-ray binary in the globular cluster M15, with archival X-ray lightcurves to study the stabilit…
Black Holes in our Galaxy: Observations
P. A. Charles
This paper reviews the X-ray, optical, radio and IR observations of galactic X-ray binaries suspected to contain black hole compact objects, with particular emphasis on the support…
Long-Term X-ray Variability in GX 354-0
A. K. H. Kong, P. A. Charles, E. Kuulkers
We report for the first time the detection of long-term X-ray variability in the bright bulge source GX 354-0 (=4U 1728-34) observed with the All Sky Monitor (ASM) on board the Ros…
Evidence for a 2 hr Optical Modulation in GS1826-24
L. Homer, P. A. Charles, D. O'Donoghue
We report the discovery of a 2.1hr optical modulation in the transient source GS1826-24, based on two independent high time-resolution photometric observing runs. There is addition…