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Circumbinary disks and cataclysmic variable evolution
H. C. Spruit, Ronald E. Taam
The influence of a circumbinary (CB) disk on the evolution of cataclysmic variable (CV) binary systems is investigated. We show that CB mass surface densities sufficient to influen…
Large scale magnetic fields and their dissipation in GRB fireballs
H. C. Spruit, F. Daigne, G. Drenkhahn
We consider possible geometries of magnetic fields in GRB outflows, and their evolution with distance from the source. For magnetically driven outflows, with an assumed ratio of ma…
The sign of temperature inhomogeneities deduced from time-distance helioseismology
M. Brüggen, H. C. Spruit
Inhomogeneities in wave propagation conditions near and below the solar surface have been detected by means of time-distance helioseismology. Here we calculate the effect of temper…
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…
Theory of solar luminosity variations
H. C. Spruit
The theory of stellar structure can be used to identify the most plausible mechanisms for the irradiance variations associated with the solar cycle. Changes in surface emissivity,…