Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6035w&link_type=abstract
HST Proposal ID #6035
Computer Science
Hst Proposal Id #6035 Hot Stars
Scientific paper
The dwarf nova HT Cas, which has an orbital period of 106 minutes, is one of the few dwarf novae in which the white dwarf and the accretion disk are eclipsed. As such, it is one of the few systems for which detailed information can be obtained about the structure of the disk and the structure of the boundary layer between the disk and the white dwarf. Indeed, because the white dwarf plus boundary layer eclipse is so prominent a feature in this system, HT Cas provides an outstanding opportunity to make progress in understanding boundary layers. We request time on HST to obtain UV spectrophotometry of HT Cas with FOS at high time resolution (3.2 and 6.4s). We will observe complete orbital cycles of HT Cas in the continuous viewing zone. The observations through eclipse will be used to eclipse map the disk in the continuum and lines and to study the white dwarf and boundary layer. The data outside eclipse will be used to Doppler map the lines and investigate the ``Fe-curtain'', if one is present. We will also study the quasi-periodic oscillations and the flickering. Outside eclipse we will determine the spectrum of the flickering and QPOs, and in eclipse we will calculate a flicker map of the disk and determine where the flickering originates.
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