Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9398h&link_type=abstract
HST Proposal ID #9398
Physics
Hst Proposal Id #9398
Scientific paper
It is now clear that X-ray irradiation is the driving force behind many of the observed properties of accretion discs on a huge range of scales from Galactic interacting binaries to AGN. However to study the detailed physics of this process requires the accessible timescales and geometrical constraints afforded by Galactic low mass X-ray binaries {LMXBs}. The ideal object for this study is EXO 0748-676 {UY Vol} because of its high inclination and full spectrum of LMXB phenomenology: type I bursts, dips and total eclipses. It is also remarkable as it was designated a transient on its discovery in 1985, but remains X-ray active to this day, thereby providing a potential unifying link between persistent and transient systems. Its present high state is likely maintained by X-ray heating; hence we can learn about a disk strongly influenced by irradiation. STIS TIMETAG observations in the far-UV will eclipse map continuum and emission lines; examine obscuration by the likely thick disk rim; and search for the UV signatures of dips and bursts. This provides an unprecedented range of techniques with which to probe the structure of an irradiated accretion disk and further our understanding of the irradiation of accretion flows in general.
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