Time-Resolved UV Spectrometry of Massive X-Ray Binaries: Cycle 3 Medium

Details Time-Resolved UV Spectrometry of Massive X-Ray Binaries: Cycle 3 Medium Time-Resolved UV Spectrometry of Massive X-Ray Binaries: Cycle 3 Medium

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4285m&link_type=abstract

HST Proposal ID #4285

Physics

Hst Proposal Id #4285

Scientific paper

We will observe pulsations and rapid variability in the UV P-Cygni lines of the optical counterpart of Vela X-1. We will use the FOS G130H in the RAPID mode to look for spectral variability at timescales ranging from 20 s to 30 m. The HST observations will be coordinated with simultaneous X-ray observations to look for correlations of the UV variability with X-ray variability and lags in the pulse waveforms. This approach yielded a successful detection of pulsations in the Si IV 1402 and N V 1238 absorption lines of Vela X-1 in a Cycle 1 HST observation that was coordinated with X- ray observations with the GINGA satellite. We will see how the UV line profile, pulse amplitude, and phase lag change with X-ray luminosity and orbital phase, in order to map the dynamics of the stellar wind and the geometry of the X-ray beam. Finally, we will search for polarization expected in the UV spectrum of Vela X-1.

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