Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4297h&link_type=abstract
HST Proposal ID #4297
Other
Hst Proposal Id #4297
Scientific paper
We propose to use the FOS to obtain time-resolved, high-resolution UV spectra of the bright novalike variable V3885 Sgr in order to determine the stability of the winds from cataclysmic variables (CVs). Changes in the P Cygni line profiles on the flow timescale of the wind itself will provide vital clues for the ultimate goal of discovering the driving mechanism for these accretion disk winds. In particular we will look for transient features already seen in radiatively driven winds from hot single stars. With the high S/N accumalated spectra we will also be able to determine the extent to which many of the subordinate lines in the spectrum have wind-formed components. This will substantially increase our understanding of the ionization state of the wind which has implications for the total mass loss rate and illuminating radiation field. The latter is sensitive to the character of the boundary layer which will tell us whether the white dwarf has been spun up to near breakup speed. Finally, the accumulated spectra can be used to constrain new NLTE accretion disk model atmospheres. The proposed observations will greatly further our understanding of the driving force behind the winds in CVs with subsequent implications for winds from other accretion disk systems such as protostars and AGN.
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