Anmerkungen:
Gedr. Ausg. im Selbstverl. D.-J. Kusterer, Stuttgart
Beschreibung:
Accretion is a very common and important process in the universe from powerful active galactic nuclei (AGN) to young stellar objects (YSO). Yet many aspects of accretion and the physics of the accretion disks involved in the process are not fully understood. A prime example is the wind'' driven off a luminous accretion disk, clear signatures of its presence are seen in observations, however neither the driving mechanism nor the resulting mass loss rates are determined in a satisfying manner. Ideal objects for a closer analysis of the accretion phenomenon are so called cataclysmic variable stars (CV). These are close binary systems formed by a white dwarf primary and a red dwarf secondary with mass flow from the Roche lobe filling secondary onto the primary. Compared to the high energies involved in AGN and the rather low energy output of YSOs, CVs are in the intermediate energy range and they also have the clear advantage of being easily observable. In this work we first introduce CVs and the phenomena observed in these systems which are connected to their nature as accretion powered objects. Especially important for our work is the so-called dwarf nova phenomenon where the accretion disk increases its brightness dramatically. In such a high state observations show that the disk is able to drive gas off in an accretion disk wind presumably by radiative driving as in winds of O stars...