Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6098e&link_type=abstract
HST Proposal ID #6098
Physics
Hst Proposal Id #6098 Hot Stars
Scientific paper
The old nova DQ Herculis is a cataclysmic binary which offers a rare combination of two important properties: (1) eclipses and (2) coherent periodic signals. We propose to exploit these properties in order to answer two fundamental questions: (1) to determine the origin of the UV emission lines and pulsations, and (2) to establish definitively the presence or absence of a wind, and to determine its origin. Our approach will be to use the behavior of the UV continuum and emission lines as the binary rotates, through eclipse, and over the rapid (71 s) oscillation cycle to construct eclipse maps and Doppler tomograms of the line emitting regions, and thus to locate the origin of the lines and to test for the presence of a wind. Since emission lines are an essential tool for probing the physical conditions and kinematics of cataclysmic variables, the importance of establishing their origin can hardly be overestimated. A system such as DQ Her, which is thought to lack an inner accretion disk, will also provide a crucial test for models of wind and outflow formation.
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