13 papers · 1 filter
Search for fast correlated X-ray and optical variability in Cir X-1 and XTE J1746-321
H. C. Spruit, H. Steinle, G. Kanbach
Coordinated observations X-ray+optical observations of two southern X-ray binaries, the black hole candidate XTE J1746-321 and the neutron star accreter Cir X-1 (a `microquasar') a…
Disks surrounding Cataclysmic Binaries
H. C. Spruit, R. E. Taam
Observations of Cataclysmic Variables show a number of phenomena that do not fit easily into the standard magnetic braking scenario. These include the large spread in mass transfer…
Correlated msec X-ray and optical emission from XTE J1118+480
G. Kanbach, C. Straubmeier, H. C. Spruit +1
We report on fast (msec) simultaneous observations in X-rays and optical light of the black hole candidate XTE J1118+480, showing correlation on time scales from 20msec to several…
Common-Envelope Evolution: the Nucleosynthesis in Mergers of Massive Stars
N. Ivanova, Ph. Podsiadlowski, H. Spruit
We study the merging of massive stars inside a common envelope for binary systems consisting of a red supergiant with a mass of 15-20 Msun and a main-sequence companion of 1-5 Msun…
Radiatively inefficient accretion disks
H. C. Spruit
Radiatively inefficient (or advection dominated) disks are discussed at an introductory level. Ion supported and radiation supported flows are discussed, the different consequences…
Spirals and the size of the disk in EX Dra
V. Joergens, H. C. Spruit, R. G. M. Rutten
Observations at high spectral and temporal resolution are presented of the dwarf nova EX Dra in outburst. The disk seen in the He I line reconstructed by Doppler tomography shows a…