Soft X-Ray Transients: Outbursts in Black Hole Accretion Disks Cycle 4 - High

Details Soft X-Ray Transients: Outbursts in Black Hole Accretion Disks Cycle 4 - High Soft X-Ray Transients: Outbursts in Black Hole Accretion Disks Cycle 4 - High

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5499h&link_type=abstract

HST Proposal ID #5499

Computer Science

Hst Proposal Id #5499 Hot Stars X-Ray Binaries

Scientific paper

We will observe soft X-ray transients (SXTs) as targets of opportunity using the FOS at UV wavelengths. This is part of an extensive multiwavelength campaign to monitor newly discovered SXTs in outburst and throughout the subsequent decline. Recent work establishes that a high proportion of SXTs harbor black holes, so these observations provide an unrivalled opportunity to obtain high quality data from an accreting black hole. UV data is a keystone of the multiwavelength campaign because the disk regions of interest radiate predominantly in the UV. Emission lines will allow us to probe the kinematics of the inner disk region. We will determine the relative strengths of the reprocessed X-ray flux emitted in the UV, and the UV flux generated by viscous heating in the accretion flow. Multiwavelength observations will probe the changing morphology of the accretion flow throughout the outburst. The observations will yield a detailed quantitative test of the thermal disk instability model for SXT outbursts. FOS work on Nova Muscae 1991 demonstrated the critical importance to this test of recording the UV and optical spectrum during the decline. An echo-mapping experiment during the bright phase of the outburst will measure the size of the reprocessing regions in the accretion disk and/or the radius of the companion star orbit using the FOS to obtain simultaneous 1100-2500A spectra and optical photometry with 2s time resolution.

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