Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6544l&link_type=abstract
HST Proposal ID #6544
Other
Hst Proposal Id #6544 Binaries And Star Formation
Scientific paper
We propose to use the GHRS to obtain moderate {Lambda / Delta Lambda 2000 } resolution, high S/N 1160-1660 A spectra of the dwarf novae SS Cyg and WX Hyi in quiescence. We will carry out a detailed study of the resonance lines - N V, CII, Si IV, C IV, and He II - in these spectra to determine the surface flux of the resonance lines as a function of radius in the disk. The derived surface fluxes will allow us to determine whether X-ray photoionization of the disk explains the UV lines and the underlying continuum of these two dwarf novae {and by extension other cataclysmic variables} whose UV spectrum appears not to be dominated by the white dwarf in quiescence. We will also use the GHRS spectra to conduct a sensitive search for the narrow metal absorption lines that should reveal the hidden WD in these two dwarf novae. Finally, we will use the spectra in an attempt to constrain suggestions that absence of material in the inner accretion disk of a quiescent dwarf nova causes the delay in UV rise to outburst that is observed in dwarf nova outbursts.
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