Towards a global understanding of accretion physics --, Clues from an UV spectroscopic survey of cataclysmic variables

Details Towards a global understanding of accretion physics --, Clues from an UV spectroscopic survey of cataclysmic variables Towards a global understanding of accretion physics --, Clues from an UV spectroscopic survey of cataclysmic variables

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9357g&link_type=abstract

HST Proposal ID #9357

Physics

Hst Proposal Id #9357

Scientific paper

Accretion inflows and outflows are fundamental phenomena in a wide variety of astrophysical environments, such as Young Stellar Objects, galactic binaries, and AGN. Observationally, cataclysmic variables {CVs} are particularly well suited for the study of accretion processes. We propose to carry out a STIS UV spectroscopic snapshot survey of CVs that fully exploits the diagnostic potential of these objects for our understanding of accretion physics. This survey will provide an homogenous database of accretion disc and wind outflow spectra covering a wide range of mass transfer rates and binary inclinations. We will analyse these spectra with state-of-the-art accretion disc model spectra {SYNDISK}, testing our current knowledge of the accretion disc structure, and, thereby, providing new insight into the so far not well understood process of viscous dissipation. We will use our parameterised wind model PYTHON for the analysis of the radiation driven accretion disc wind spectra, assessing the fundamental question whether the mass loss rate correlates with the disc luminosity. In addition, our survey data will identify a number of systems in which the white dwarf significantly contributes to the UV flux, permitting an analysis of the impact of mass accretion on the evolution of these compact stars. This survey will at least double, if not triple, the number of high-quality accretion disc / wind outflow / accreting white dwarf spectra, and we waive our proprietary rights to permit a timely use of this database.

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