Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8308g&link_type=abstract
HST Proposal ID #8308
Computer Science
Hst Proposal Id #8308 Binary Stars
Scientific paper
We propose to make the first ever investigation of the FUV spectrum of the unusual X-ray binary, SS 433, using STIS and its sensitive MAMA detector. The unexplored FUV region should offer significant clues about the nature of the mass- losing star and mass loss by winds. Our plan is to obtain spectra at key phases in the disk precessional cycle in order to document the spectral variations associated with this ``clock''. We will use a tomography algorithm to separate the FUV spectral features associated with the moving jets and the "stationary" disk and star components, and we will compare the optical and FUV light curves to establish the flux contributions from the various parts of this system. We will search for the UV P Cygni profiles associated with winds to test if colliding winds are a source of the X-ray flux. The huge redshifts associated with the jets will translate jet flux from the Lyman limit into the region near Ly-alpha, and these variations will help elucidat e the radiative processes that dri ve the jets. The proposed observations offer an exceptional opportunity to study the mass loss processes at this singular stage in binary star evolution.
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