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Geometrical constraints upon the unipolar model of V407 Vul and RXJ0806.3+1527
S. C. C. Barros, T. R. Marsh, P. Groot +5
V407 Vul and RX J0806.3+1527 are X-ray emitting stars with X-ray light curves that are 100% modulated on periods of 569 and 321 seconds respectively. These periods and no others ar…
Optical spectroscopy of (candidate) ultra-compact X-ray binaries
Gijs Nelemans, Peter Jonker
We present (preliminary) results of our systematic spectroscopic study of (candidate) ultra-compact X-ray binaries. Most candidates are confirmed and we found the first optical spe…
What can we learn about black-hole formation from black-hole X-ray binaries?
G. Nelemans
I discuss the effect of the formation of a black hole on a (close) binary and show some of the current constraints that the observed properties of black hole X-ray binaries put on…
Reconstructing the evolution of white dwarf binaries: further evidence for an alternative algorithm for the outcome of the common-envelope phase in close binaries
G. Nelemans, C. A. Tout
We determine the possible masses and radii of the progenitors of white dwarfs in binaries from fits to detailed stellar evolution models and use these to reconstruct the mass-trans…
Photometric Variability in the Faint Sky Variability Survey
L. Morales-Rueda, P. J. Groot, T. Augusteijn +3
The Faint Sky Variability Survey (FSVS) is aimed at finding photometric and/or astrometric variable objects between 16th and 24th mag on time-scales between tens of minutes and yea…
The radial velocity of the companion star in the low-mass X-ray binary 2S 0921-630: limits on the mass of the compact object
P. G. Jonker, D. Steeghs, G. Nelemans +1
In this Paper we report on optical spectroscopic observations of the low-mass X-ray binary 2S 0921-630 obtained with the Very Large Telescope. We found sinusoidal radial velocity v…
AM CVn stars
Gijs Nelemans
I review our observational and theoretical knowledge of AM CVn stars, focusing on recent developments. These include newly discovered systems, the possibility that two recently dis…
Recycled pulsars with black hole companions: the high mass analogues of PSR B2303+46
M. S. Sipior, S. Portegies Zwart, G. Nelemans
We investigate the possibility that mass transfer early in the evolution of a massive binary can effect a reversal of the end states of the two components, resulting in a neutron s…
The distances to Galactic low-mass X-ray binaries: consequences for black hole luminosities and kicks
P. G. Jonker, G. Nelemans
We investigated the reported distances of Galactic black hole (BH) and neutron star low-mass X-ray binaries (LMXBs). Comparing the distances derived for the neutron stars CygX-2 an…
Double degenerates and progenitors of supernovae type Ia
R. Napiwotzki, L. Yungelson, G. Nelemans +12
We report on systematic radial velocity surveys for white dwarf - white dwarf binaries (double degenerates - DDs) including SPY (ESO Supernovae Ia progenitor survey) recently carri…
Close binary EHB stars from SPY
R. Napiwotzki, C. A. Karl, T. Lisker +5
We present the results of a radial velocity (RV) survey of 46 subdwarf B (sdB) and 23 helium-rich subdwarf O (He-sdO) stars. We detected 18 (39%) new sdB binary systems, but only o…