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Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9791k&link_type=abstract
HST Proposal ID #9791
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Hst Proposal Id #9791 Hot Stars
Scientific paper
Cataclysmic variables {CVs} are outstanding accretion laboratories. As a result, insights gleaned from CVs have critically shaped our conceptual picture of accretion processes in astrophysical systems on all scales. In particular, the accretion disks found in nova-like cataclysmic variables {NLCVs} have long been thought of as *the* classic examples of standard, steady-state disks.However, there is a group of NLCVs - the SW Sex stars - whose remarkable properties clearly do NOT fit the standard disk model. Many other NLCVs also show some symptoms of the SW Sex syndrome, as does at least one neutron star low-mass X-ray binary system. The existence of the SW Sex stars throws serious doubt on the validity of the standard picture in NLCVs and other disk-accreting systems. It is therefore vital to uncover the cause of this phenomenon. The SW Sex star DW UMa is ideally suited for an HST study that will achieve this goal. Because DW UMa is located in the CVZ, we can use STIS to obtain time-resolved, far-ultraviolet spectroscopy of the system for two complete, consecutive binary orbits. The resulting data set will allow us to resolve the SW Sex controversy by distinguishing clearly between all competing models.
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