Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2248b&link_type=abstract
HST Proposal ID #2248
Physics
Hst Proposal Id #2248
Scientific paper
We propose to use the HST FOS to study the UV spectra of threelow-mass X-ray binaries (LMXRB). Our goals are to investigate the physical structure of their accretion disks and investigate the effects of X-ray heating in these systems. Studies of their UV spectra will lead to; -constraints on the accretion disk thickness and the effects of X-ray heating from comparison of the UV and X-ray luminosities, and from the studies of the UV spectral shape; -a probe of the sites of UV line emission. Possible locations for the emission line region are the accretion disk itself and the irradiated photosphere of the companion star. Only space-borne instrumentation can study the far UV spectra of these objects. Most LMXRB are too faint to have been observed with IUE. Only five have been studied with IUE and only Cen X-4 (in outburst) and Sco X-1 have yielded data of even moderate signal-to-noise ratio. It is highly desirable to extend this sample to include LMXRB of various types - bursters, dippers, accretion disk corona and 'normal' bulge sources - to search for systematic differences between them. The HST is uniquely suitable for obtaining moderate resolution UV spectra of these objects.
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