6 citations · 7 across the 4 of their papers we have counts for
7 papers · 1 filter
Reconstructing the evolution of double helium white dwarfs: envelope loss without spiral-in
Gijs Nelemans, Frank Verbunt, Lev R. Yungelson +1
The unique core-mass - radius relation for giants with degenerate helium cores enables us to reconstruct the evolution of three observed double helium white dwarfs with known masse…
Discovery of 1RXS J171824.2-402934 as an X-ray burster
R. G. Kaptein, J. J. M. in 't Zand, E. Kuulkers +3
We report the first-time detection of a type-I X-ray burst from a position that is consistent with that of 1RXS J171824.2-402934. The detection was made on Sep 23, 1996, with the W…
The likely detection of pulsed high-energy gamma-ray emission from millisecond pulsar PSR J0218+4232
L. Kuiper, W. Hermsen, F. Verbunt +5
We report circumstantial evidence for the first detection of pulsed high-energy gamma-ray emission from a millisecond pulsar, PSR J0218+4232, using data collected with the Energeti…
Multiple and variable X-ray sources in the globular clusters omega Cen, NGC6397, NGC6752, and Liller 1
Frank Verbunt, Helen M. Johnston
We detect stars from the Hipparcos and Tycho Catalogues in the field of view of observations with the ROSAT HRI of three globular clusters. We use the positions of these stars to r…
The longest thermonuclear X-ray burst ever observed? (A BeppoSAX Wide Field Camera observation of 4U 1735-44)
R. Cornelisse, J. Heise, E. Kuulkers +2
A long flux enhancement, with an exponential decay time of 86 min, is detected in 4U 1735-44 with the BeppoSAX Wide Field Cameras. We argue that this is a type-I X-ray burst, makin…
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…