5 papers · 1 filter
High-speed, multi-colour optical photometry of the anomalous X-ray pulsar 4U 0142+61 with ULTRACAM
V. S. Dhillon, T. R. Marsh, F. Hulleman +5
We present high-speed, multi-colour optical photometry of the anomalous X-ray pulsar 4U 0142+61, obtained with ULTRACAM on the 4.2-m William Herschel Telescope. We detect 4U 0142+6…
Optical and Infrared Observations of Anomalous X-ray Pulsars
Martin Durant, Marten H. van Kerkwijk, Ferdi Hulleman
The detection of optical/infrared counterparts to Anomalous X-ray Pulsars (AXPs) has greatly increased our understanding of these systems. Models for the AXP phenomenon were based…
Optical and near-infrared observations of Anomalous X-ray pulsars
Ferdi Hulleman
We present recent results of our program of deep optical and near-infrared observations of AXPs. We find that the counterpart to AXP 4U 0142+61 has a peculiar spectral energy distr…
A deep search for the optical counterpart to the anomalous X-ray pulsar 1E 2259+58.6
F. Hulleman, M. H. van Kerkwijk, F. W. M. Verbunt +1
We present Keck R and I band images of the field of the anomalous X-ray pulsar 1E 2259+58.6. We derive an improved X-ray position from archival ROSAT HRI observations by correcting…
Discovery of the transient X-ray pulsar SAX J2103.5+4545
F. Hulleman, J. J. M. in 't Zand, J. Heise
We report the discovery of the X-ray transient SAX J2103.5+4545 which was active from February to September 1997. The observed peak intensity of 20 mCrab (2 to 25 keV) occurred on…