The UV Orbital Light Curve of the X-Ray Binary X1822-371

Details The UV Orbital Light Curve of the X-Ray Binary X1822-371 The UV Orbital Light Curve of the X-Ray Binary X1822-371

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3579m&link_type=abstract

HST Proposal ID #3579

Physics

Hst Proposal Id #3579

Scientific paper

We are proposing to obtain the first far-UV orbital light curve of an eclipsing low-mass X-ray binary by making FOS observations of the V=15 system X1822-371. The shape of the UV light curve as a function of energy will be used to determine the geometry of the hottest, X-ray illuminated parts of the accretion disk and will provide information that is crucial to determining whether the disk in this X-ray binary has a thick, structured rim. The FOS data will also permit us to construct light curves of the flux in the high excitation UV emission lines such as CIV 1549 and NV 1249, allowing us to determine where they are formed in the system and investigate how they are excited. This will be the first detailed study of UV orbital variations in a member of this important class of X-ray binary, and can only be done with HST. This proposal was approved at supplemental priority in cycle~1 but has not yet been scheduled.

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