Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7773m&link_type=abstract
HST Proposal ID #7773
Physics
Hst Proposal Id #7773 Binary Stars
Scientific paper
After many years of murky views of the boundary layers of CVs, EUVE recently has provided "high" spectral resolution {Lambda/DeltaLambda 200} EUV spectra of a number of dwarf novae in outburst. EUVE has also measured the dwarf nova oscillations in the boundary layer radiation of SS Cyg, and determined the spectrum of the oscillations for the first time. This boundary layer radiation has important effects on the winds of CVs, on the white dwarf primary, the secondary, and the accretion disk. Reprocessing of the boundary layer radiation is manifest in the He II lines in the optical and UV and in the low-amplitude oscillations in the optical flux of CVs. Multicolor optical photometry strongly implies that the amplitude of these oscillations will be strong in the UV, but no measurements exist to confirm this prediction. Worse yet, no measurements exist in the optical or UV with sufficient spectral resolution to distinguish the lines from the continuum. To study the reprocessing of the boundary layer radiation in the optical and UV, we propose to undertake a multiwavelength campaign using RXTE, EUVE, HST, and ground- based optical telescopes to characterize the dwarf nova oscillations of SS Cyg. We will use the HST STIS/NUV-MAMA with the G230L grating and the STIS/FUV-MAMA with the G140L and E140H gratings to separately measure the response of the UV lines and continuum to the EUV/soft X-ray oscillations of the boundary layer flux.
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