High-Speed UV Spectroscopy of the Ultracompact Binary 4U 1626--67/KZ TrA

Details High-Speed UV Spectroscopy of the Ultracompact Binary 4U 1626--67/KZ TrA High-Speed UV Spectroscopy of the Ultracompact Binary 4U 1626--67/KZ TrA

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7510c&link_type=abstract

HST Proposal ID #7510

Computer Science

Hst Proposal Id #7510 Binary Stars

Scientific paper

The ultracompact X-ray binary 4U 1626-67/KZ TrA has the shortest {42-min} orbital period of any known binary pulsar system and the smallest known mass function {<10^-6M_odot} of any stellar binary. The mass donor in the system is thought to be an extremely low-mass hydrogen-depleted star, possibly a helium dwarf or helium-burning star. I will use time-resolved STIS UV spectroscopy to measure the orbital phase variation of the reprocessed X-ray flux, thereby constraining the inclination angle and mass ratio of the binary. In addition, cross-correlation of the time-resolved UV spectra with proposed simultaneous X-ray data from the Rossi X-Ray Timing Explorer {RXTE} will permit detailed study of the accretion disk structure through propagation delay mapping using the 7.7 s X-ray pulsations, the 20-s X-ray quasi-periodic oscillation {QPO}, the 42-min binary binary modulation of the X-ray illumination, and the intrinsic flaring behavior of the accreting neutron star.

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