Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4914h&link_type=abstract
HST Proposal ID #4914
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #4914
Scientific paper
We will use the FOS in RAPID readout mode to obtain time-resolved ultraviolet spectrophotometry of accretion disk eclipses in two long-period cataclysmic variables, the nova-like variable UX UMa and the dwarf nova IP Peg in outburst and quiescence. From the eclipse data in the UV lines and continuum, we will map the structure of the hot inner accretion disk, boundary layer, and stream-disk interaction region using a combination of light-curve synthesis and maximum entropy mapping techniques. The principle goal of this experiment is to study the structure of accretion disks in order to test accretion disk models that are applied widely throughout astrophysics, e,g, in models of protostars and active galactic nuclei. The observations will also permit a study of the geometry of winds in these systems, and more accurate determinations of the masses, radii, and temperatures of the primary and secondary stars, which will contribute to our understanding of the evolution of close binary systems. NOTE: TAC has cut the UX UMa observations from this proposal. NOTE: This repeats 2 G160L eclipses ala HOPR#85.
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