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Dynamical Evidence for a Black Hole in the Microquasar XTE J1550-564
Jerome A. Orosz, Paul J. Groot, Michiel van der Klis +6
Optical spectroscopic observations of the companion star (type G8IV to K4III) in the microquasar system XTE J1550-564 reveal a radial velocity curve with a best fitting spectroscop…
The Quiescent Spectrum of the AM CVn star CP Eri
Paul J. Groot, Gijs Nelemans, Danny Steeghs +1
We used the 6.5m MMT to obtain a spectrum of the AM CVn star CP Eri in quiescence. The spectrum is dominated by He I emission lines, which are clearly double peaked with a peak-to-…
The optical long `period' of LMC X-3
C. Brocksopp, P. J. Groot, J. Wilms
We have studied the long term variability of LMC X-3 in optical lightcurves spanning six years, in order to search for optical signatures which could confirm/refute the suggestion…
Spectroscopic evidence for the binary nature of AM CVn
G. Nelemans, D. Steeghs, P. J. Groot
We analysed archival spectroscopic data of AM CVn taken with the William Herschel Telescope in 1996. In the literature two orbital periods for AM CVn are proposed. A clear S-wave i…
Complete and Simultaneous Spectral Observations of the Black-Hole X-ray Nova XTE J1118+480
J. E. McClintock, C. A. Haswell, M. R. Garcia +13
The X-ray nova XTE J1118+480 suffers minimal extinction (b = 62 degrees) and therefore represents an outstanding opportunity for multiwavelength studies. Hynes et al. (2000) conduc…
Evolution of spiral shocks in U Gem during outburst
Paul J. Groot
Time resolved spectroscopic observations of U Gem during its March 2000 outburst show strong spiral shocks in the accretion disk. During the plateau at maximum brightness the spira…